How to calculate accuracy from confusion matrix?

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sandhya sandhya
sandhya sandhya on 30 May 2019
Answered: Rik on 30 May 2019
How to calculate accuracy from confusion matrix?
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darova
darova on 30 May 2019
Im confused a little bit. What do you mean?

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Answers (1)

Rik
Rik on 30 May 2019
Accuracy = (TP+TN)/(TP+TN+FP+FN)
where: TP = True positive; FP = False positive; TN = True negative; FN = False negative
As you can find on Wikipedia ( https://en.m.wikipedia.org/wiki/Accuracy_and_precision )
So it should be trivial to calculate the accuracy from your confusion matrix: divide the sum of the diagonal by the total sum.

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