How to calculate true positive, true negative, false positive and false negative?

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Wiktoria Bukowska
回答： Shreeya 2024-1-13
Hello everyone!
I created artificial neural network to compute answers for my diagnosis. Now, I would like to compare the amount of true positive, true negative, false positive and false negative. I was thinking about creating a loop and count every values.
Thank you for your help.

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回答（1 个）

Shreeya
Shreeya 2024-1-13
To calculate the TP, TN, FP, FN, you can refer to the code down below.
% An example considering 1 & 2 as positive and 3 as negative:
real = [1 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3];
predicted = [2 2 3 2 1 2 3 2 3 3 3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3];
realPos = (real==1) | (real == 2);
realNeg = ~realPos;
predictedPos = (predicted==1) | (predicted == 2);
predictedNeg = ~predictedPos;
TP = sum(predictedPos & realPos) % 6
FP = sum(predictedPos & realNeg) % 1
TN = sum(predictedNeg & realNeg) % 27
FN = sum(predictedNeg & realPos) % 6
This code has been sourced from the MATLAB answer linked here: https://www.mathworks.com/matlabcentral/answers/1997058-how-can-i-calculate-true-positive-false-positive-true-negative-and-false-negative-of-real-and-pred
You can refer to the discussion for more details.

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