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Re: st: RE: x axis forest plot


From   Roger Harbord <rmharbord@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: x axis forest plot
Date   Thu, 7 Oct 2010 18:22:58 +0100

You are meta-analysing risk ratios (the "rr" option). -metan- plots
ratio effect measures on a logarithmic scale, because that's the
sensible thing to do (Galbraith 1988). You are trying to label a ratio
of 0. The logarithm of 0 results in a missing value, hence the error
message. Try another value instead. xlabel(0.2,1,5)  would keep 1 in
the centre of the plot.

Reference:
Galbraith R.  A note on graphical presentation of estimated odds
ratios from several clinical trials.  Statistics in Medicine
1988;7:889-894. DOI:10.1002/sim.4780070807

Regards,
Roger.

-- 
Roger Harbord
http://www.epi.bris.ac.uk/staff/rharbord.htm


On 7 October 2010 14:58, Vincent de Jonge <v.dejonge@erasmusmc.nl> wrote:
> one of the commands I used was:
>
> metan a b c d, label(namevar=Author) by(HQ) random rr xlabel(0,1,5) force
>
> with this error:
> invalid label specifier, :  0 "1" . "0" 0 "1" 1.6094379124341 "5":
>
> or
> metan a b c d, label(namevar=Author) by(HQ) random rr xlabel(0,1,5)
> invalid label specifier, :  0 "1" . "0" 0 "1" 1.6094379124341 "5":
>
> is that of any help?
>
> on 07-10-2010 14:48 Nick Cox said the following:
>>
>> -metan- is a user-written command (SSC).
>> It usually helps and never hurts if you show exact code that you tried.
>> In general with a graphics command you can not omit data points from a
>> graph by truncating the axis scale. You must omit data explicitly e.g. by
>> using -if-.
>> -xaxis()- and -xlabel()- are options, not commands.
>> Nick n.j.cox@durham.ac.uk
>> Vincent de Jonge
>>
>> I did a meta-analysis on count data using the db metan command and plotted
>> a forest plot. However, to improve readability I would like to limit the x
>> axis. This just won't work. I don't know how to do it. Tried commands like
>> xaxis, xlabel, etc. but always get an error. Hope someone can get me the
>> answer.

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