How to compute overall precision, specificity and sensititivity?
Hello Weka Users:
I have a very basic question. I used J4.8 for classification. I want to
compute the overall (weighted averages) precision, specificity and
I found two ways, but not sure which one is right.
1.Overall Precision = No. of instances per class (C) * Precision for
class (C) / Total no. of instances
2. Overall Precision = No. of instances predicted as class (C) *
Precision for class (C) / No. of instances predicted
I would appreciate very much any help or references related to this.