Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: dots and non-dots


From   Tom Palmer <tom.palmer@bristol.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: dots and non-dots
Date   Tue, 7 Aug 2012 17:30:23 +0100

Hi Stas,

See "Stata tip 41: Monitoring loop iterations" by David A. Harrison in The Stata Journal 7(1) page 140.

Available here

http://www.stata-journal.com/article.html?article=pr0030

Tom


> When running the replicate variance estimation methods, such as
> bootstrap or jackknife, we are being entertained by the running dots
> for each replication. If everything goes well, we see just the dots.
> If things don't go that well, we see some red "x"s or "e"s or "s".
> What are the meanings of these special codes? (Hint: I know what to
> -viewsource- here, but I would hate to second guess how this cute
> little fully undocumented command is being used. By "fully
> undocumented" I mean that it is not even mentioned in -help
> undocumented-.)
> 
> Some of the reasons when the user needs to know something went awry
> may be: no observations (somehow we bootstrapped a bad sample that
> does not have anything satisfying the "if" condition of the main
> command); some of the estimated coefficients don't exist (-rmcoll-
> dropped a different variable in the bootstrapped sample than in the
> first call); an iterative procedure did not converge or produced some
> other meaningless result (a perfect prediction in -logit-). There may
> be other circumstances. Are these symbols explained anywhere?
> 
> If it is not documented, may be it is worth writing a blog entry about
> these dots, just to help something to lean on.
> 
> -- 
> ---- Stas Kolenikov
> -- 
> http://stas.kolenikov.name
> 
> ---- Senior Survey Statistician, Abt SRBI
> -- Opinions stated in this email are mine only, and do not reflect the
> position of my employer

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index