st: npt_s stratified test for trend across ordered groups

["M.Wood" <mwood@hunter.cuny.edu>]

I would like to use npt_s (STB-33) but I get return code 198 in stata 7
and stata 8 as well. I also tried the command on the example dataset as
per the STB text but still no luck. Possibly someone has updated?

thanks,

Michael Wood
Hunter College, City University of New York

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