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Re: st: problems with e(sample)


From   "Zurab Sajaia" <zsajaia@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: problems with e(sample)
Date   Fri, 16 Jun 2006 18:33:56 -0400

I found the cause of problem, -restore- works after setting all the ereturns and it clears e(sample) leaving other parameters unchanged.

"esample(varname) specified with ereturn post or repost gives the name of the 0/1 variable indicating the observations involved in the estimation. The variable is removed from the data but is available for use as e(sample);"

This is what they say in the help so it's still unclear to me why e(sample) disapeares after restoring original data...




From: Richard Williams <Richard.A.Williams.5@ND.edu>
Reply-To: statalist@hsphsun2.harvard.edu
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: problems with e(sample)
Date: Fri, 16 Jun 2006 18:21:40 -0500

At 04:22 PM 6/16/2006, Zurab Sajaia wrote:
Hi all,

I ecountered a problem with disapearing e(sample) and couldn't find what can be wrong:

I have an eclass program, which sets leaves some ereturn parameters as well as setting e(sample)

program myprogram, eclass

...
ereturn post, esample(`touse')
ereturn local cmd="myprogram"
...

count if e(sample)
end // myprogram

When I run the program -count- within the program displays correct number but if I write
.count if e(sample) from command line, it returns 0. Somehow e(sample) gets cleared although other parameters, for example e(cmd) still contains "myprogram".
We might need to see a little more code here. Here is my version of myprogram.ado:

program myprogram, eclass
tempvar touse
gen `touse' = 1
ereturn post, esample(`touse')
ereturn local cmd="myprogram"
count if e(sample)
end

Here it is in action:

. sysuse auto
(1978 Automobile Data)

. myprogram
74

. count if e(sample)
74

So, it seems to work fine for me. i also tried

gen `touse' = foreign

and that worked fine too, yielding counts of 22. So, I don't think there is an inherent problem, but something else in your code may be zapping things.


-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
FAX: (574)288-4373
HOME: (574)289-5227
EMAIL: Richard.A.Williams.5@ND.Edu
WWW (personal): http://www.nd.edu/~rwilliam
WWW (department): http://www.nd.edu/~soc

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