which ration is valid for crossvalidation how many instances of data does training use how many instances of a data set are cross validated for testing in cross validation what is the cross validation for training which of the following is correct for cross validation? what is cross validation in training and testing what is the ration for cross validation what is the cross validation for training what is the correct ration for cross validation is testing cross validated what is testing cross validation how many instances of dataset for training how does cross validation work on training when to test cross validation what is crossvalidation cross validation on training and testing can cross validation be used on training and testing what is the difference between testing and cross validation? how many instances in a data set for crossvalidation what is the best cross validation ration