[R-meta] Back transformation of arcsine transformed data in meta-regression
@c @end|ng |rom |mb|@un|-|re|burg@de
Thu Feb 6 09:09:04 CET 2020
The maximum value you can get for arcsine transformed proportions is
1.571 (for a proportion of 100%) which you can see using the following R
Accordingly, the intercept 3.06 in your meta-regression is way of the
mark due to extrapolating the effect of the continuous variable year.
The intercept represents the effect at year 0 A.D.
I would suggest that you center the variable year around some value.
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
Mail: sc using imbi.uni-freiburg.de
ORCID iD: https://orcid.org/0000-0001-6214-9087
More information about the R-sig-meta-analysis