[R-meta] [R meta] How to print z score for subgroup analysis

Guido Schwarzer @c @end|ng |rom |mb|@un|-|re|burg@de
Mon May 20 11:21:16 CEST 2019


The z-scores for the individual subgroup effects (if this is what you 
are looking for) are not shown in the output, however, they are part of 
the meta-analysis object.

You can use the following command to extract the z-scores and p-values 
for the fixed effect and random effects model:

      data.frame(bylevs, zval.fixed.w, pval.fixed.w,
                 zval.random.w, pval.random.w))

However, you should abstain from selectively reporting significant 
subgroup results. Instead, the Cochrane Handbook 
(https://handbook-5-1.cochrane.org/) gives the following advice (among 
other things) on subgroup analyses: (1) conduct a test for subgroup 
differences (section which Michael already mentioned and (2) do 
not compare the statistical significance of the results within separate 
subgroup analyses (section 9.6.6).

Best wishes, Guido

Dr. Guido Schwarzer
Institute of Medical Biometry and Statistics,
Faculty of Medicine and Medical Center - University of Freiburg

Postal address: Stefan-Meier-Str. 26, D-79104 Freiburg

Phone: +49/761/203-6668
Mail: sc using imbi.uni-freiburg.de
Homepage: http://www.imbi.uni-freiburg.de

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