[R] questions about "metafor" package

[Jeremy Miles]

.
>
> -         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