Confusion Matrix Results Sensitivity

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Gledson Melotti 2017-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/371767-confusion-matrix-results-sensitivity

评论： Gledson Melotti 2018-3-15

How do I calculate the sensitivity and specificity with the confusionmat command? What is the position of TP, FP, FN, TN in the confusion matrix provided by matlab? I use the "confusionmat".

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Answer 1

YT 2017-12-14

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编辑：YT 2017-12-14

在 MATLAB Online 中打开

Just use the following.

[cm, order] = confusionmat(real_values,predicted_values)

You can check it here ( https://www.mathworks.com/help/stats/confusionmat.html ).

Assuming your confusionmatrix is 2x2, it will look like this:

    %CONFUSIONMAT OUTPUT
    %%%%%%%%%%%%%%%%%%%%%%
    %          predicted
    %         | 0     1
    %    r  -----------
    %    e  0 | TN   FP
    %    a  1 | FN   TP
    %    l
    %%%%%%%%%%%%%%%%%%%%%%

*EDIT

confusionmat() does not calculate sensitivity, accuracy, F-score and those kind of derivations for you, you need to do them yourself. Just check this out, it's pretty easy.