How to calculate AUC of ROC curve from these data ?

Question

Pradya Panyainkaew 2018-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/396532-how-to-calculate-auc-of-roc-curve-from-these-data

回答： Sharmili S 2023-1-27

Hi everyone I have my raw data that I attach in this question.These data are output from a neural network classification and I am able to plot ROC curve from them. by the code below;

figure(1)
plotroc(targets_train,outputs_train)
title({'ROC Curve of Train Set for Neural network classification'})
xlabel('False positive rate') % x-axis label
ylabel('True positive rate') % y-axis label
figure(2)
plotroc(targets_testset,outputs_test)
title({'ROC Curve of Test Set for Neural network classification'})
xlabel('False positive rate') % x-axis label
ylabel('True positive rate') % y-axis label

However, I don't have any idea, how to calculate AUC of ROC curve from these data ?.

Anyone help me,please ?

Thanks in advance

Pradya

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Victor Daniel Reyes Dreke 2020-5-18

Try to use the function [tpr,fpr]=roc(targets,outputs). This function outcomes are the true positive rate and false positive rate used to build the ROC Curve. Finally, trapz(fpr,tpr) will give you the area under the ROC curve

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