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RE: st: using postfile in a loop


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: using postfile in a loop
Date   Mon, 9 Nov 2009 23:58:22 +0100

<>

Sure, this is an "implicit" loop, sorry about that!

You would loop over the distinct values of variables as in the FAQ cited
earlier...


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Kushan Thakkar
Sent: Montag, 9. November 2009 23:53
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: using postfile in a loop

I meant to say that if I have the following data,

cusip date ticker prc

If I do gen newvar, it would automatically do it for all the
datapoints (hence gen command has a built-in loop).

However, I want to know how can I do the same by using an actual
foreach loop that loops over cusip or data variable.

Thanks

On Mon, Nov 9, 2009 at 5:40 PM, Martin Weiss <martin.weiss1@gmx.de> wrote:
>
> <>
>
> http://www.stata.com/support/faqs/data/foreach.html
>
>
>
> What do you mean by " gen variable with built-in loop"?
>
> HTH
> Martin
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Kushan Thakkar
> Sent: Montag, 9. November 2009 23:34
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: using postfile in a loop
>
> Thanks everyone for calling me out on the no loop part.
>
> On a different note, how can I loop on a single variable ? For
> example, let's say if I wanted to loop over the date variable and then
> over the cusip variable, how would I go about doing this? I understand
> that there is no need to explicitly create loop since I can use gen
> variable with built-in loop. However, I want to do this so that I can
> understand how loops and postfile work with each other.
>
> Thanks.
>
> On Mon, Nov 9, 2009 at 5:14 PM, Maarten buis <maartenbuis@yahoo.co.uk>
> wrote:
>> --- On Mon, 9/11/09, Kushan Thakkar wrote:
>>> I have a dataset the contains the following data:
>>>
>>> cusip ticker date prc ....(few more variables).... RminusI
>>>
>>> I need to isolate data points for which RminusI is less
>>> than its first decile and then post these data points in a
>>> different file.
>>
>> This is not a case for -postfile- or a loop. In the example
>> below nlsw88.dta is your master data, grade is your id variable,
>> and wage is your RminusI variable.
>>
>> *---------- begin example --------------
>> sysuse nlsw88, clear
>> bys grade: egen lb = pctile(wage), p(10)
>> keep if wage < lb
>> *------------ end example --------------
>> ( For more on how to use examples I sent to statalist see:
>> http://www.maartenbuis.nl/stata/exampleFAQ.html )
>>
>> Hope this helps,
>> Maarten
>> --------------------------
>> Maarten L. Buis
>> Institut fuer Soziologie
>> Universitaet Tuebingen
>> Wilhelmstrasse 36
>> 72074 Tuebingen
>> Germany
>>
>> http://www.maartenbuis.nl
>> --------------------------
>>
>>
>>
>>
>>
>>
>>
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