Hi Rick,

I have 10 columns in my dataset, 3 of which are like classification variables , I need to populate 2 new columns with the mean and std dev of the 4 of the remaining 7 numerical columns respectively. Each row in column 11 and 12 giving me the mean and std dev of the values in the corresponding columns 4-7.

Is there a way I can pass information as to which columns to consider while calculating mean?