How measure sensitivity and specificity when using kfold cross validation?

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Zeynab Mousavikhamene
回答： Divya Gaddipati 2020-4-15
I need to measure the sensitivity and specificity on the observations not used fro training in kfold cross validation like kfoldLoss fucntion that measures classification loss for observations not used for training.
What function does that?

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Divya Gaddipati
Divya Gaddipati 2020-4-15
Hi,
You can use confusionmat to obtain the True Positive (TP), True Negative (TN), False Positive (FP), False Negative (FN), which can be used to calculate the Sensitivity and Specificity using the formula:
Sensitivity = TP/(TP+FN)
Specificity = TN/(TN+FP)
[cm, order] = confusionmat(target, predicted)
%% Assuming your confusion matrix is 2x2, it will look like this:
% | 0 1
% -----------
% 0 | TN FP
% 1 | FN TP
For more information, you can refer to the following link:
https://www.mathworks.com/help/stats/confusionmat.html
Hope this helps!

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