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Re: st: Get back to original sample data


From   Steven Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Get back to original sample data
Date   Sun, 5 Jun 2011 10:24:15 -0400

Continuing on Nick's theme:

*******
preserve
drop if substr(string(sich), 1, 1) == "4"
[do stuff]
restore
*******

if the analysis is the same for all subsets, then:

*****************
foreach m of numlist 1 3 4 7 9{
preserve
drop if substr(string(sich), 1, 1) == "`m'"
di "All firms except sich = `m'xxx"
[do stuff]
restore
}
*******************

Steve

On Jun 5, 2011, at 5:20 AM, Nick Cox wrote:

gen is4 = substr(string(sich), 1, 1) == "4"

... if is4

Nick

On Sun, Jun 5, 2011 at 9:32 AM, Achmed Aldai <Hauptseminar@gmx.de> wrote:
> Hi
> 
> I am currently working on a do file where I am eliminating firms of different industries. Here is an extract
> 
> gvkey           sich
> 1001            1120
> 1001            1120
> 1001            1120
> 1001            1120
> 1001            1120
> 1200            2310
> 1200            2310
> 1200            2310
> 1200            2310
> 3201            4320
> 3201            4320
> 3210            4335
> 3210            4335
> 
> If I drop e.g. all firms with a beginning sich of 4: After this analysis I want to have all the firms in my sample again. So how can I come back to the complete sample again to do another analysis.
> I want to have all this in the same do file.

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