[R] Metafor: How to integrate effectsizes?

Michael Dewey info at aghmed.fsnet.co.uk
Fri Apr 25 16:22:50 CEST 2014

At 12:33 25/04/2014, you wrote:
>Thank you very much for your reply and the book recommendation, Michael.
>Yes, I mean Cohen's d - sorry for the typo :-)
>Just to make this sure for me: There is no 
>possibility to integrate stated Cohens' ds in an 
>R-Metaanalysis (or a MA at all), if there is no 
>further information traceable regarding SE or the like?

If there is really no other information like 
sample sizes, significance level, value of some 
significance test then you would have to impute a 
value from somewhere. That would seem a last resort.

I have cc'ed this back to the list, please keep 
it on the list so others may benefit and contribute.

>best regards,
>On Fri, Apr 25, 2014 at 1:21 PM, Michael Dewey 
><<mailto:info at aghmed.fsnet.co.uk>info at aghmed.fsnet.co.uk> wrote:
>At 13:15 24/04/2014, Verena Weinbir wrote:
>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. Â 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
>Â  Â author = {Cooper, H and Hedges, L V},
>Â  Â title = {A handbook of research synthesis},
>Â  Â year = {1994},
>Â  Â publisher = {Russell Sage},
>Â  Â address = {New York},
>Â  Â 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,
>Â  Â  Â  Â  [[alternative HTML version deleted]]
>Michael Dewey
><mailto:info at aghmed.fsnet.co.uk>info at aghmed.fsnet.co.uk

Michael Dewey
info at aghmed.fsnet.co.uk

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