To someone who could help me:
 
I am a PhD student, working in the Wageningen University, the
Netherlands.  I am now using metafor package to do meta-analysis. 
 
Since there are few studies conducted on my topic, I have to combine the
results from 5 case-control studies and 1 cohort study. But I do not
know how to do it.
 
I tried this way, first, use the escalc (measure="OR", ai, bi, ci, gi)
to calculate the effect estimate of yi and variance of vi.
 
I could extract the RR and 95% confidence interval from the cohort study
to get the point estimate of LnRR and SE.
 
but I can not combine the results from case-control study and the
results from cohort study due to the difference of vi and SE.
 
For example, if I use rma(yi, vi, data,), I can not get vi (variance)
for the cohort study. I can only get SE for cohort study. How could
solve it?
 
Thanks for your time.
 
Best wishes,
 
Yingchang (Kevin) Lu

PhD student,

Division of Human Nutrition

Wageningen University

Tel: 0031-317-485300

Fax:0031-317-482782

http://www.hne.wur.nl/UK/Organisation/nutrition-metabolism-genomics
<http://www.hne.wur.nl/UK/Organisation/nutrition-metabolism-genomics/> 


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