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st: AW: using postfile in a loop


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: using postfile in a loop
Date   Mon, 9 Nov 2009 22:58:48 +0100

<> 

Simply

*************
preserve
	su RminusI, det
	keep if RminusI<r(p10)
	save myfile, replace
restore
*************

and "myfile" will contain the cases you want. Make it a -tempfile- if
desired...


-post- does not take an -if- qualifier, for one. And "r(p10)" would  not be
available to the -if- qualifier since you did not specify -detail- as an
option to your -summarize-...


HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Kushan Thakkar
Gesendet: Montag, 9. November 2009 22:54
An: statalist@hsphsun2.harvard.edu
Betreff: st: using postfile in a loop

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
the code I am using.

=========================================

use masterfile

sort date ticker prc

quitely sum RminusI

tempname A
tempfile signals

postfile 'A' ticker date prc using `signals', replace

post `A' (if RminusI < r(p10) )  //post to a new file if RminusI is
less than first decile

postclose `A'

=========================================

However, after the post command I get the following error:

ifRminusI not found
post: above message corresponds to expression 1, variable cusip


What am I doing wrong? Is there a more efficient way to do this ?

Thanks,
Kush
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