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Re: st: problems with e(sample)
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 <[email protected]>
Reply-To: [email protected]
To: [email protected]
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: [email protected]
WWW (personal): http://www.nd.edu/~rwilliam
WWW (department): http://www.nd.edu/~soc
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