. > > - Firstly, for each observation, I have means for a treatment and for > a control, but I don’t always have corresponding standard deviations (52 of a > total of 93 observations don’t have standard deviations). Nevertheless I have > the sample sizes for all observations so I wonder if it was possible to > weight observations by sample size in the package « metafor ».
Following what Wolfgang said, do you have some other information, such as p-values, or standard errors of the difference, or confidence intervals, which would allow you to calculate (or approximate) the pooled SD? jeremy ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
