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st: RE: Re: RE: Re: regexr and missing values


From   Howard Lempel <HLempel@brookings.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: RE: Re: regexr and missing values
Date   Fri, 17 Oct 2008 17:08:09 -0400

Martin,

-update query- is what told me that Stata had last been updated on 10/15/07.

-help whatsnew- told me that the -regex- functions have not been updated since then.

Thanks again,
Howie

Howie Lempel
Research Assistant
The Brookings Institution | Economic Studies

1775 Massachusetts Ave NW | Washington DC 20036
hlempel@brookings.edu | p: (202) 238-3576


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss
Sent: Friday, October 17, 2008 5:01 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: Re: RE: Re: regexr and missing values

Yeah, well, that is not a foolproof method to check. You should rather
type -update query- when connected to be absolutely sure...

HTH
Martin
_______________________
----- Original Message -----
From: "Howard Lempel" <HLempel@brookings.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Friday, October 17, 2008 10:59 PM
Subject: st: RE: Re: regexr and missing values


> Thanks, Martin!
>
> I now know that lack of updating is not the problem.
>
> Howie
>
> Howie Lempel
> Research Assistant
> The Brookings Institution | Economic Studies
>
> 1775 Massachusetts Ave NW | Washington DC 20036
> hlempel@brookings.edu | p: (202) 238-3576
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss
> Sent: Friday, October 17, 2008 4:53 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Re: regexr and missing values
>
> "I also do not know how to see what Stata has updated since my last
> update":
> see -help whatsnew-
>
> HTH
> Martin
> _______________________
> ----- Original Message -----
> From: "Howard Lempel" <HLempel@brookings.edu>
> To: <statalist@hsphsun2.harvard.edu>
> Sent: Friday, October 17, 2008 10:34 PM
> Subject: st: regexr and missing values
>
>
>> Hello all,
>>
>> I'm using Stata 10 (last updated 10/10/07) and am having a bit of trouble
>> with the -regexr- function.  I can't tell if I've stumbled on a bug or if
>> I'm doing something wrong.
>>
>> I am trying to use -regexr- to transform a string variable called
>> lfpatfin.  I'd like to take every observation where the last letter in
>> lfpatfin is "U" and substitute an "E" for the "U".  The code appears to
>> work except that two observations where lfpatfin was missing have been
>> replaced with an "E".  This appears to be similar to a problem Yun Liu
>> had
>> with -regexm- on July 16 in this thread:
>> http://www.stata.com/statalist/archive/2008-07/msg00596.html, but I can't
>> tell if Yun's issue was ever resolved.  I have been unable to reproduce
>> the problem using the auto dataset or a dataset generic dataset I
>> created.
>> My code and some output follows.  I did nothing to test in between
>> generating it and the -list- command.
>>
>> gen test = regexr(lfpatfin,"U$", "E")
>> list lfpatfin test in 1/1000 if lfpatfin != test
>>
>>      +-----------------+
>>      | lfpatfin   test |
>>      |-----------------|
>>  70. |      FRU    FRE |
>> 105. |      RFU    RFE |
>> 148. |        U      E |
>> 161. |        U      E |
>> 554. |       FU     FE |
>>      |-----------------|
>> 861. |       FU     FE |
>> 914. |        U      E |
>>      +-----------------+
>> list lfpatfin test if missing(lfpatfin) & !missing(test)
>>
>>       +-----------------+
>>       | lfpatfin   test |
>>       |-----------------|
>> 20074. |               E |
>> 24067. |               E |
>>       +-----------------+
>>
>> . list lfpatfin test in 16000/16200 if missing(lfpatfin)
>>
>>       +-----------------+
>>       | lfpatfin   test |
>>       |-----------------|
>> 16156. |                 |
>> 16162. |                 |
>> 16166. |                 |
>> 16170. |                 |
>> 16175. |                 |
>>       |-----------------|
>> 16176. |                 |
>> 16179. |                 |
>> 16180. |                 |
>> 16183. |                 |
>> 16186. |                 |
>>       |-----------------|
>> 16197. |                 |
>>       +-----------------+
>>
>> For what it's worth, I try to make similar changes to lfpatfin
>> (substituting "B"s for final "D"s) later in my code and had the same
>> problem.
>>
>> I'd appreciate it a lot if anyone has any explanation.  I also do not
>> know
>> how to see what Stata has updated since my last update, but I would be
>> grateful if anyone knows where to go for that - I'd like to check whether
>> the -regex- functions have been changed.  Unfortunately, I don't have the
>> admin rights to update my version of Stata.
>>
>> Thanks for your consideration.
>> Howie
>>
>>
>> Howie Lempel
>> Research Assistant
>> The Brookings Institution | Economic Studies
>>
>> 1775 Massachusetts Ave NW | Washington DC 20036
>> hlempel@brookings.edu | p: (202) 238-3576
>>
>>
>>
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>>
>
>
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