At 13:15 24/04/2014, Verena Weinbir wrote:
Hello!
I am using the metafor package for my master's thesis as an R-newbie. While
calculating effectsizes from my dataset (mean values and
standarddeviations) using "escalc" shouldn't be a problem (I hope ;-)), I
wonder how I could at this point integrate additional studies, which only
state conhens d (no information about mean value and sds available), to
calculate an overall analysis. I would be very grateful for your support!
You mean Cohen's d I think.
You will need some more information to enable you to calculate its
standard error. Have a look at Rosenthal's chapter in
@book{cooper94,
author = {Cooper, H and Hedges, L V},
title = {A handbook of research synthesis},
year = {1994},
publisher = {Russell Sage},
address = {New York},
keywords = {meta-analysis}
}
(There is an updated edition)
This gives you more information about converting effect sizes and
extracting them from unpromising beginnings.
It often requires some ingenuity to get the information you need so
have a go and then get back here with more details if you run into problems
Best regards,
Verena
[[alternative HTML version deleted]]
Michael Dewey
i...@aghmed.fsnet.co.uk
http://www.aghmed.fsnet.co.uk/home.html
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