[R-meta] [netmeta] Error message in network meta-analysis: "Problem with multi-arm studies: Studies with inconsistent treatment estimates"

Guido Schwarzer @c @end|ng |rom |mb|@un|-|re|burg@de
Fri Feb 7 17:49:50 CET 2020

Hi Rebecca,

I assume the problem is related to calculating SMDs in multi-arm 
studies. Each pairwise comparison (in a multi-arm study) uses a 
different pooled standard deviation to calculate the SMD which leads to 
inconsistent effects.

You could / should use pairwise() to calculate the SMDs which considers 
the same pooled standard deviation to calculate the SMD in multi-arm 

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

ORCID iD: https://orcid.org/0000-0001-6214-9087
R-book: https://www.springer.com/gp/book/9783319214153

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