This function went undocumented in Stata 9.
You can blame Svend Juul. Svend gave a very
witty talk at a Berlin users' meeting pointing
out functions and -egen- functions with the same name, but
different definitions; the same definition,
but different names; and much else besides.
His talk is here:
http://www.stata.com/meeting/2german/Juul.pdf
So, StataCorp looked in the stables, and saw
that he was right. It was a mess. So, they
went to work renaming, and tidying a few
ancient oddities out of sight.
Actually, you can blame me, as I recall
suggesting that this one be hidden, my
argument being that -egen, group()-,
although it came later, was far more
useful and far more widely used. I
still think that's true.
-group()-, which is a function, not an option,
is documented at version 8 [R] p.454.
group(n) divides the data into n nearly
equal groups, with integer values 1 to ceil(n).
That depends on the current sort order.
-group(varname)- appears equivalent to
sort varname
... = group(max of varname)
<sort back again>
Nick
[email protected]
roy wada
> Can someone tell me what kind of distribution is created by
> -group( )-
> option for -gen- command? I am using 9.1 for Windows.
>
> sysuse auto, clear
> gen repNew=group(rep78)
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