[R-meta] Calculating SMD from posttest only - is this possible?

Guido Schwarzer @c @end|ng |rom |mb|@un|-|re|burg@de
Mon Oct 7 14:16:28 CEST 2019

Hi Roberto,

Just to add to the responses by Wolfgang and James.

The Cochrane Handbook warns against combining SMDs based on change 
scores (pre-post comparisons) and post-test comparisons (see 
The reason is that the standard deviation used in the denominator of the 
SMD is different for change scores and post-tests.

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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