st: mkmat

[baum <baum@bc.edu>]

Chris wondered how to pick up the correct number of columns after using 
xpose, which generates v1,v2,...

use http://fmwww.bc.edu/ec-p/data/wooldridge/wagepan,clear
keep nr-occ9
collapse black-occ9, by(year)
summ year,meanonly
local en = r(N)
xpose, clear varname
mkmat v1 - v`en',mat(one)

xpose,clear
keep if year < 1985
summ year,meanonly
local en = r(N)
xpose, clear varname
mkmat v1 - v`en',mat(two)

Kit
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