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What are the positions of the elements of the confusion matrix? How to calculate accuracy and fscore of the matrix of confusion using matlab?

Asked by Gledson Melotti on 15 Mar 2018
Latest activity Answered by Morteza Pakdaman on 12 Jul 2019
For example, the confusion matrix (confMat) is: confMat(1,1) = 104, confMat(1,2) = 1242, confMat(2,1) = 14 and confMat(2,2) = 14199. In matalab using accuracy = mean(diag(confMat)) provides 0.5381. However, using the relation: accuracy=(TP+TN)/(TP+TN+FP+FN)=91.92. I have two classes and unbalanced dataset.
I believe the matrix of confusion in matlab is: confMat(1,1) = TN, confMat (1,2) = FP, confMat (2,1) = FN and confMat(2,2) = TP. Whereas: Horizontal = predicted class and Vertical = real class

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1 Answer

Answer by Morteza Pakdaman on 12 Jul 2019
 Accepted Answer

Your final belief is correct.

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