Confusion matrix logic












5












$begingroup$


Can someone explain me the logic behind the confusion matrix?




  • True Positive (TP): prediction is POSITIVE, actual outcome is POSITIVE, result is 'True Positive' - No questions.

  • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

  • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

  • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?


enter image description here










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  • $begingroup$
    Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
    $endgroup$
    – Mitch
    Mar 21 at 18:22
















5












$begingroup$


Can someone explain me the logic behind the confusion matrix?




  • True Positive (TP): prediction is POSITIVE, actual outcome is POSITIVE, result is 'True Positive' - No questions.

  • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

  • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

  • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?


enter image description here










share|improve this question







New contributor




Tauno Tanilas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$












  • $begingroup$
    Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
    $endgroup$
    – Mitch
    Mar 21 at 18:22














5












5








5





$begingroup$


Can someone explain me the logic behind the confusion matrix?




  • True Positive (TP): prediction is POSITIVE, actual outcome is POSITIVE, result is 'True Positive' - No questions.

  • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

  • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

  • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?


enter image description here










share|improve this question







New contributor




Tauno Tanilas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




Can someone explain me the logic behind the confusion matrix?




  • True Positive (TP): prediction is POSITIVE, actual outcome is POSITIVE, result is 'True Positive' - No questions.

  • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

  • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

  • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?


enter image description here







confusion-matrix






share|improve this question







New contributor




Tauno Tanilas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question







New contributor




Tauno Tanilas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question






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asked Mar 21 at 9:34









Tauno TanilasTauno Tanilas

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261




New contributor




Tauno Tanilas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor





Tauno Tanilas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Tauno Tanilas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • $begingroup$
    Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
    $endgroup$
    – Mitch
    Mar 21 at 18:22


















  • $begingroup$
    Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
    $endgroup$
    – Mitch
    Mar 21 at 18:22
















$begingroup$
Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
$endgroup$
– Mitch
Mar 21 at 18:22




$begingroup$
Stick to positive/negative for the test, and True/false for whether the test matches reality (actual outcome). Then it should be clear.
$endgroup$
– Mitch
Mar 21 at 18:22










4 Answers
4






active

oldest

votes


















3












$begingroup$

A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).



The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.



The name of the different cases are taken from the predictor's point of view.



True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.



The 4 different cases in the confusion matrix:



True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.



False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.



False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.



True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.






share|improve this answer









$endgroup$









  • 2




    $begingroup$
    Thanks a lot! It's all clear now :)
    $endgroup$
    – Tauno Tanilas
    Mar 21 at 11:04





















1












$begingroup$

Please find the below:




  • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

    Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.


  • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

    Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.


  • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?

    Answer : The predicted output supposed to be Negative, and model also predicted as Negative.



For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.



Thank you,
KK






share|improve this answer









$endgroup$





















    1












    $begingroup$

    Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!



    Here are my 5 cents:



    The names are all of this kind:



    <True/False> <Positive/Negative>
    | |
    Part1 Part2



    1. The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.


    2. The second part explains the prediction of the model.



    So:




    • False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).


    • False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).


    • True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)







    share|improve this answer









    $endgroup$





















      0












      $begingroup$


      True means Correct, False means Incorrect.




      True Positive (TP): Model predicts P, which is Correct.



      False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.



      True Negative (TN): Model predicts N, which is Correct.



      False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.






      share|improve this answer









      $endgroup$













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        4 Answers
        4






        active

        oldest

        votes








        4 Answers
        4






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes









        3












        $begingroup$

        A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).



        The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.



        The name of the different cases are taken from the predictor's point of view.



        True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.



        The 4 different cases in the confusion matrix:



        True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.



        False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.



        False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.



        True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.






        share|improve this answer









        $endgroup$









        • 2




          $begingroup$
          Thanks a lot! It's all clear now :)
          $endgroup$
          – Tauno Tanilas
          Mar 21 at 11:04


















        3












        $begingroup$

        A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).



        The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.



        The name of the different cases are taken from the predictor's point of view.



        True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.



        The 4 different cases in the confusion matrix:



        True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.



        False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.



        False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.



        True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.






        share|improve this answer









        $endgroup$









        • 2




          $begingroup$
          Thanks a lot! It's all clear now :)
          $endgroup$
          – Tauno Tanilas
          Mar 21 at 11:04
















        3












        3








        3





        $begingroup$

        A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).



        The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.



        The name of the different cases are taken from the predictor's point of view.



        True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.



        The 4 different cases in the confusion matrix:



        True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.



        False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.



        False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.



        True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.






        share|improve this answer









        $endgroup$



        A confusion matrix is a table that is often used to describe the performance of a classification model. The figure you have provided presents a binary case, but it is also used with more than 2 classes (there are just more rows/columns).



        The rows refer to the actual Ground-Truth label/class of the input and the columns refer to the prediction provided by the model.



        The name of the different cases are taken from the predictor's point of view.



        True/False means that the prediction is the same as the ground truth and Negative/Positive refers to what was the prediction.



        The 4 different cases in the confusion matrix:



        True Positive (TP): The model's prediction is "Positive" and it is the same as the actual ground-truth class, which is "Positive", so this is a True Positive case.



        False Negative (FN): The model's prediction is "Negative" and it is wrong because the actual ground-truth class is "Positive", so this is a False Negative case.



        False Positive (FP): The model's prediction is "Positive" and it is wrong because the actual ground-truth class is "Negative", so this is a False Positive case.



        True Negative (TN): The model's prediction is "Negative" and it is the same as the actual ground-truth class, which is "Negative", so this is a True Negative case.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Mar 21 at 10:02









        Mark.FMark.F

        1,0091420




        1,0091420








        • 2




          $begingroup$
          Thanks a lot! It's all clear now :)
          $endgroup$
          – Tauno Tanilas
          Mar 21 at 11:04
















        • 2




          $begingroup$
          Thanks a lot! It's all clear now :)
          $endgroup$
          – Tauno Tanilas
          Mar 21 at 11:04










        2




        2




        $begingroup$
        Thanks a lot! It's all clear now :)
        $endgroup$
        – Tauno Tanilas
        Mar 21 at 11:04






        $begingroup$
        Thanks a lot! It's all clear now :)
        $endgroup$
        – Tauno Tanilas
        Mar 21 at 11:04













        1












        $begingroup$

        Please find the below:




        • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

          Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.


        • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

          Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.


        • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?

          Answer : The predicted output supposed to be Negative, and model also predicted as Negative.



        For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.



        Thank you,
        KK






        share|improve this answer









        $endgroup$


















          1












          $begingroup$

          Please find the below:




          • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

            Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.


          • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

            Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.


          • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?

            Answer : The predicted output supposed to be Negative, and model also predicted as Negative.



          For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.



          Thank you,
          KK






          share|improve this answer









          $endgroup$
















            1












            1








            1





            $begingroup$

            Please find the below:




            • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

              Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.


            • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

              Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.


            • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?

              Answer : The predicted output supposed to be Negative, and model also predicted as Negative.



            For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.



            Thank you,
            KK






            share|improve this answer









            $endgroup$



            Please find the below:




            • False Negative (FN): prediction is NEGATIVE, actual outcome is POSITIVE, result is 'False Negative' - Why is that? Shouldn't it be 'False Positive'?

              Answer : The predictive model supposed to give the answer as 'Positive', but it predicted as 'Negative', which means Falsely predicted as Negative aka False Negative.


            • False Positive (FP): prediction is POSITIVE, actual outcome is NEGATIVE, result is 'False Positive' - Why is that? Shouldn't it be 'True Negative'?

              Answer : The predictive model supposed to give the answer as 'Negative', but it predicted as 'Positive', which means Falsely predicted as Positive aka False Positive.


            • True Negative (TN): prediction is NEGATIVE, actual outcome is NEGATIVE, result is 'True Negative' - Why is that? Shouldn't it be 'False Negative'?

              Answer : The predicted output supposed to be Negative, and model also predicted as Negative.



            For better understanding, you can run a simple binary classfication model and analyze the confusion matrix.



            Thank you,
            KK







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Mar 21 at 10:07









            KK2491KK2491

            343219




            343219























                1












                $begingroup$

                Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!



                Here are my 5 cents:



                The names are all of this kind:



                <True/False> <Positive/Negative>
                | |
                Part1 Part2



                1. The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.


                2. The second part explains the prediction of the model.



                So:




                • False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).


                • False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).


                • True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)







                share|improve this answer









                $endgroup$


















                  1












                  $begingroup$

                  Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!



                  Here are my 5 cents:



                  The names are all of this kind:



                  <True/False> <Positive/Negative>
                  | |
                  Part1 Part2



                  1. The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.


                  2. The second part explains the prediction of the model.



                  So:




                  • False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).


                  • False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).


                  • True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)







                  share|improve this answer









                  $endgroup$
















                    1












                    1








                    1





                    $begingroup$

                    Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!



                    Here are my 5 cents:



                    The names are all of this kind:



                    <True/False> <Positive/Negative>
                    | |
                    Part1 Part2



                    1. The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.


                    2. The second part explains the prediction of the model.



                    So:




                    • False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).


                    • False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).


                    • True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)







                    share|improve this answer









                    $endgroup$



                    Seems like you understand the meaning of the confusion matrix, nut not the logic used to name its entries!



                    Here are my 5 cents:



                    The names are all of this kind:



                    <True/False> <Positive/Negative>
                    | |
                    Part1 Part2



                    1. The first part explains if the prediction was right or not. If you have only True Positive and True Negative your model is perfect. If you have only False Positive and False Negative your model is really bad.


                    2. The second part explains the prediction of the model.



                    So:




                    • False Negative (FN): the prediction is NEGATIVE (0) but the first part is False, this means that the prediction is wrong (should have been POSITIVE (1)).


                    • False Positive (FP): the prediction is POSITIVE (1) but the first part is False, this means that the prediction is wrong (should have been NEGATIVE (0)).


                    • True Negative (TN): prediction is NEGATIVE and the first part is True. The prediction is right (model predicted NEGATIVE, for NEGATIVE samples)








                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered Mar 21 at 10:44









                    Francesco PegoraroFrancesco Pegoraro

                    56717




                    56717























                        0












                        $begingroup$


                        True means Correct, False means Incorrect.




                        True Positive (TP): Model predicts P, which is Correct.



                        False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.



                        True Negative (TN): Model predicts N, which is Correct.



                        False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.






                        share|improve this answer









                        $endgroup$


















                          0












                          $begingroup$


                          True means Correct, False means Incorrect.




                          True Positive (TP): Model predicts P, which is Correct.



                          False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.



                          True Negative (TN): Model predicts N, which is Correct.



                          False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.






                          share|improve this answer









                          $endgroup$
















                            0












                            0








                            0





                            $begingroup$


                            True means Correct, False means Incorrect.




                            True Positive (TP): Model predicts P, which is Correct.



                            False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.



                            True Negative (TN): Model predicts N, which is Correct.



                            False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.






                            share|improve this answer









                            $endgroup$




                            True means Correct, False means Incorrect.




                            True Positive (TP): Model predicts P, which is Correct.



                            False Positive (FP): Model predicts P, which is Incorrect, must have predicted N.



                            True Negative (TN): Model predicts N, which is Correct.



                            False Negative (FN): Model predicts N, which is Incorrect, must have predicted P.







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered Mar 21 at 15:53









                            EsmailianEsmailian

                            1,736115




                            1,736115






















                                Tauno Tanilas is a new contributor. Be nice, and check out our Code of Conduct.










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