[R] Add prediction interval forest plot (package "meta")

Michael Dewey info at aghmed.fsnet.co.uk
Fri Jun 7 16:02:36 CEST 2013

At 12:39 07/06/2013, Bernd Weiß wrote:
>Am 07.06.2013 13:17, schrieb Michael Dewey:
>>At 19:34 06/06/2013, Bernd Weiss wrote:
>>>Dear all,
>>>I am struggling to add a prediction interval to a forest plot that was
>>>created with forest.meta(), package "meta".
>>>I checked the source of forest.meta() and realized that it is heavily
>>>relying on grid. I am lacking any experience with grid graphics. So, I
>>>am having difficulties to find out where the random effects estimate is
>>>actually plotted in order to add prediction intervals.
>>I appreciate this is not a direct answer to your question but the
>>equivalent function in metafor (available from CRAN) does this and it
>>might be easier to use that.
>Thanks, Michael!
>Yes, I vaguely remember that the metafor package 
>can calculate the PIs but most of our analyses 
>rely on the meta package. On the other hand, 
>this might be a good reason to finally switch to metafor.
>You probably refer to the function addpoly() 
>which can be used for that. I will check it out.

I was thinking of the addcred parameter to 
forest.rma.uni in fact, although you could roll your own.

>Again, thanks for your help,

Michael Dewey
info at aghmed.fsnet.co.uk

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