I ran a 10-fold cross-validation BayesNet (but it could be any method in WEKA), and the output I got was (among other things):
... === Stratified cross-validation === === Summary === Correctly Classified Instances 142 88.75 % Incorrectly Classified Instances 18 11.25 % Kappa statistic 0.8594 K&B Relative Info Score 13968.9989 % K&B Information Score 324.3318 bits 2.0271 bits/instance Class complexity | order 0 371.9209 bits 2.3245 bits/instance Class complexity | scheme 13057.6688 bits 81.6104 bits/instance Complexity improvement (Sf) -12685.748 bits -79.2859 bits/instance Mean absolute error 0.045 Root mean squared error 0.212 Relative absolute error 14.0471 % Root relative squared error 52.9716 % Total Number of Instances 160 ...
My questions is related to the Correctly Classified Instances. In this case I got 142 out of 160, but on which run? To my knowledge, a 10-fold cross-validation runs several times. This statistic is for which run?
For all of them?
And if it was an average on all runs, don't you guys think that it's a little bit convenient that the number was a nice integer (I ran a lot of classifications and its always an integer).