11-07-2014 10:18 AM
If your purpose is to compare two distributions of a variable is the same across different groups, this can be done using the EDF option in PROC NPAR1WAY. See the example titled "EDF Statistics and EDF Plot" in the NPAR1WAY documentation.
11-07-2014 11:54 AM
Are you trying to assess whether the 10th percentiles of two groups are the same? Here is a blog (that uses R) that contains some references to the literature: http://freakonometrics.hypotheses.org/4199