d STB-9 snp4.  Nonparametric test for trend across ordered groups.
d STB insert by 
d K. A. Stepniewska, Imperial Cancer Research Fund, London. 
d D. G. Altman, Imperial Cancer Research Fund, London.
d Support:  k_stpniewska@@icrf.ac.uk
d After installation, see help ^nptrend^.

f snp4/nptrend.ado
f snp4/nptrend.hlp