deletes all rows with mean greater than 5 and variance less than 3. Every statistic referenced in this expression must be selected on the Statistics tab.When you have specified grouping variables , the SAS variable names of the computed statistics columns are numbered sequentially (for example, MEAN1 , MEAN2 , MEAN3 , ...). The SAS labels for these variables are not numbered sequentially, but rather consist of the levels of the grouping variables.