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st: Teach an old dog new tricks


From   "Sergiy Radyakin" <serjradyakin@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Teach an old dog new tricks
Date   Thu, 8 May 2008 10:16:38 -0400

Hello Statalisters,

I am looking for a way to get the matrix of means, which is displayed
but not saved by, e.g.:

sysuse auto
table rep78 head, c(mean price)

The (relatively new) svy commands allow this, but they are quite slow
for the purpose. -table- was in Stata for ages, but it still does not
save any matrix results.

I am aware of an option replace, which saves the means in the dataset,
but it destroys the data, - something I am trying to avoid. Adding
preserve/restore will slow the program down sufficiently enough to
reject this way of doing it.

Is it possible to obtain a matrix of means from table (or another
command with a similar functionality) (preferred) ? Or is it possible
to tell table,replace to keep the existing data and add the computed
statistics as new variables (good)?

Note that tabstat does not allow what I am looking, since it only
supports one var in the by() clause, and I will need to call it N
times (where N is the number of categories in the second var) and
combine the columns together, which is not fast either.

Also note, that while

   tabulate rep78 foreign, matcell(A)

is a valid syntax,

  tabulate rep78 foreign, matcell(A) summarize(price) mean

which presumably could be the solution I am looking for, is not valid:
  r(198); option matcell() not allowed

Any suggestions are welcomed.

Thank you,
  Sergiy Radyakin
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