search for: tp4564907p4565175

Hi, I wrote a function which works for one group but not for multiple groups in several years. Could anyone help me out? The dateset has 3 variables, year, group, and sales. I want to calculate the annual group median adjusted sales performance for observation i in group j and year yr, I do the following procedure. For each yar, 1. exclude observation i from group j 2. calculate the sales median