d STB-42 gr28.  A graphical procedure to test equality of variances.
d STB insert by Aurelio Tobias, 
d Institut Municipal d'Investigacio Medica (IMIM).
d Support:  atobias@@imim.es
d After installation, see help ^grvar^.

f gr28/grvar.ado
f gr28/grvar.hlp
f gr28/sokal.dta