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Re: st: m:m merge not working properly


From   Phil Clayton <philclayton@internode.on.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: m:m merge not working properly
Date   Wed, 11 Jan 2012 09:04:36 +1100

You may want to look at -joinby-, or the user-written -mmerge- (SSC) which implements m:m merging using -joinby- rather than -merge- and adds a few convenience features.

Phil

On 11/01/2012, at 5:02 AM, Impavido, Gregorio wrote:

> I am not surprised: m:m has an infinite possible combinations and the computer simply randomizes. In fact I am not sure what is the use to allow m:m in merge to start with.  This is similar to using sort without the stable option (see -help sort-).  In any case, I am curious to hear what stata corp has to say.
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> Sent: Tuesday, January 10, 2012 12:46 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: m:m merge not working properly
> 
> I would contact tech support with details of your Stata, the datasets,
> the exact commands and a log of results. See
> 
> http://www.stata.com/support/faqs/techsup/sendout.html
> 
> Nick
> 
> On Tue, Jan 10, 2012 at 5:39 PM, Yakusheva, Olga
> <olga.yakusheva@yale.edu> wrote:
> 
>> Running stata 11 and the merge m:m command produces different sample size each time I run it in the same session. If I close out and start a new session, the merge will give me a consistent sample size but will start bouncing again if rerun without exiting. 1:1, 1:m and m:1 appear to work fine.
> 
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