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st: RE: Functions in Stata

From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: Functions in Stata
Date   Fri, 8 Aug 2008 18:30:26 +0100

This was the exchange Sergiy refers to. 

I don't think that users can produce beasts like e(sample). My guess is
that StataCorp are using unpublicised hooks to do that. 

--------------------------------------------------------------- 19 Dec
2003 ---
Nick Cox

See [U] 21.10 Saving results. 

Zurab Sajaia
> I'm trying to find out how create some kind of function in 
> stata. After any
> estimation command  (regress for example)
> eret list gives functions: e(sample). If I write
>  gen a=e(sample)
> and if we specified IF and/or IN options in regress, a=1 
> for those in
> subsample and 0 otherwise. So, e(sample) is a function but 
> how can I return other functions from my program?
Sergiy Radyakin

there was a question asked earlier on Fri, 19 Dec 2003 regarding
defining functions in Stata, but essentially no answer was given (or
none that I could find). Nick Cox pointed to the manual (I don't know
which edition, but "saving results" is now 18.10 of [U]). This part of
the manual does not describe the functions though.

Here are some observations:

Observation 1: some Stata commands return functions, e.g. -regress-
returns e(sample)

Observation 2: it is possible to get a list of defined functions by
reading extended macro function:

  sysuse auto
  regress p w
  display `"`:e(functions)'"'

Observation 3: none of the official .ado files eshibits this feature

Observation 4: none of the user commands that I've seen uses this

If there is any new information available now, that was not available
in 2003 I would be glad to hear that.

Why do I need to know this? I am writing a command that automatically
processes the results saved in r() e() s() and at the very least I
need to know whether any user-defined command could, can or will be
able to save anything in the "functions" section.

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