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Re: st: Stata 12 -twoway function, horizontal recast(area)- bug affecting -confunnel-


From   Hua Peng <hpeng@stata.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Stata 12 -twoway function, horizontal recast(area)- bug affecting -confunnel-
Date   Tue, 27 Mar 2012 11:09:15 -0500

Tom Palmer <Tom.Palmer@bristol.ac.uk> reported

> There is a problem in Stata version 12.1 (and 12.0) when -twoway function- > is used with the -horizontal- and -recast(area)- options. In the following
> the second overlaid plot is drawn incorrectly:
>
>  twoway function x, horizontal || function x, horizontal recast(area)
>
> The bug does not occur when I run this code in Stata version 11.2, but
> strangely does occur in Stata 12.1 under version control, i.e. the above
> command prefixed with say -version 11.2:-
>
> My -confunnel- program (for contour enhanced funnel plots in meta-analysis)
> uses commands like this and hence its plots under Stata 12 with shaded
> regions (the default) are now incorrect, luckily -confunnel- plots using
> the -noshadedregions- option are unaffected.
>

In the 06feb2012 update of Stata 12, -twoway area- was changed to use an
internal drawing routine that is significantly faster over large datasets.
A bug was introduced in the process which drew the plot incorrectly if
the -horizontal- option was used.

We will fix the bug in the next executable update.


Hua
--hpeng@stata.com

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