I did a classification project and now I need to calculate the weighted average precision, recall and f-measure, but I don't know their formulas. some files are two classes, some are three classes and some are four classes. I need the formulas containing tp1, fp1, fn1, tn1, tp2, fp2, fn2, tn2 and .... And also I need the reference, too, because I have to refer to it in my thesis.
Vahideh Torabi, these two links might help you. The weighted metrics consider the number of instances of each class.
https://www.quora.com/How-do-I-compute-for-the-overall-Precision-and-Recall-Do-I-get-the-Precision-and-Recall-for-each-class-and-get-the-average
http://scikit-learn.org/stable/modules/generated/sklearn.metrics.recall_score.html
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