[R] meta-analysis normal quantile plot metafor

[Ricc]

Hello,
I used the default parameters:
- envelope: default is TRUE
- level: the default is to take the value from the object (I do not
understand this very well)
- bonferroni : no
- reps : default is 1000
- smooth: default is TRUE
- bass : default is 0

 I used no other arguments.


2012/1/13 Michael Dewey <info at aghmed.fsnet.co.uk>:
> At 15:53 11/01/2012, Ricc wrote:
>>
>> Hello,
>>
>> I once used the metawin software to perform a meta-analysis (see
>> metawinsoft, Rosenberg et al.) and produced normal qqplot to test for
>> a potential bias in the dataset.
>> I now want to re-use the same dataset with the package metafor by W.
>> Viechtbauer (great package btw).
>>
>> I run the qqnorm.rma.uni function. I use standardized effect sizes as
>> in metawin.
>
>
> I think it would help if you said which parameters you used to control the
> envelope. Did you smooth it? Did you use the Bonferroni correction?
>
>
>
>> QQplot generated with metafor differs from the plot obtained with
>> metawin: most of the datapoint fall outside the confidence envelope
>> (using the same confidence level). I don't understand very well how
>> the "pseudo confidence envelope" was created in metafor. Is it more
>> conservative than that from metawin or created using the package
>> envelope ? Unfortunately I do not have access to metawin's code so
>> that I cannot compare implementations but the manual let me think that
>> metawin print classical confidence interval...
>>
>> Thanks for input !
>> Ricc
>>
>> More precisions:
>> R version 2.13.1 (2011-07-08)
>> Platform: x86_64-pc-linux-gnu (64-bit)
>> metafor_1.6-0
>
>
> Michael Dewey
> info at aghmed.fsnet.co.uk
> http://www.aghmed.fsnet.co.uk/home.html
>