Just one more post on this ...
"Alfonso Miranda" noted that :
> Having a second look I found that
>
> mymat = 12.4869*H
>
>
> Thus, Stata is giving me the correct matrix except for a constant. I
> believe Stata is doing some sort of standarization when unsing the
> variable res2 as an analytical weigh, isn't it ?. Could any one explain
> me how does it works?
If you examine the output from mat accum you see:
> > .matrix accum H = a1 a2 a3 [aw=res2], noc
> > (sum of wgt is 2.4974e+03)
> > (obs=200)
> >
your constant of 12.49 is simply the ratio of the sum of the weights to the
number of obs :
2497.4 / 200 = 12.49
Michael Blasnik
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