Re: Meta-analysis for regression coefficients

Posted by Bruce Weaver on Mar 25, 2013; 10:27pm
URL: http://spssx-discussion.165.s1.nabble.com/Meta-analysis-for-regression-coefficients-tp5719057p5719077.html

Assuming you mean you want to do two meta-analyses, one for each coefficient, then the standard methods should work.  See this article by Fleiss for a nice overview of the standard methods:

  http://smm.sagepub.com/content/2/2/121.short

By the way, I found this statement in your post rather odd: "Some coefficients were calculated mathematically and I don't have SDs for those coefficients."  Surely they were all calculated mathematically, weren't they?  Anyway, as the Fleiss article shows, you need to have an estimate of the coefficient for each study and the corresponding standard error (SE, not SD).  If the SE is missing, I think you have two choices:  1) exclude those studies, or 2) estimate the missing SEs.  If you opt for 2, then you should probably run the analysis with a range of estimates plugged in as a kind of sensitivity analysis.  How many of them are missing the SE?

HTH.

Sungeun Chung-2 wrote

Dear SPSS-L experts

I haven't done meta-analysis before but I need to do it now. I am trying to teach myself about meta-analysis and would like to have some wisdom from the experts here.
My problems is that I have results from 16 studies and want to do meta-analysis for two regression coefficients  
My data look like this:

study b1 b2 sample size 　 coefficients standardized?
S -0.06 0.14 549 　 unstandarized
P, T, & H1 0.34 0.04 101 　 standardized
P, T, & H2 0.15 -0.1 129 　 unstandarized
P, T, & H2 -0.19 0.25 241 　 standardized
S & D 0.39 0.07 132 　 standardized
T, R, & C 0.39 0.07 132 　 standardized
G 0.66 0.31 632 　 standardized
G & H 0.02 0.24 506 　 standardized
L & W 0.1 0.13 1335 　 standardized
L & T 0.25 0.41 232 　 standardized
M et al. -0.18 0.18 198 　 standardized
E et al. 0.25 -0.01 359 　 unstandarized
S et al 1 0.26 0.18 167 　 unstandarized
S et al 2 0.01 0.37 167 　 unstandarized
N & F 1 0.26 0.12 152 　 standardized
N et al 0.09 0.33 520 　 standardized

Some coefficients were calculated mathematically and I don't have SDs for those coefficients.

Can I find numbers for overall effects for two variables through meta-analysis? 
What are the methods and programs that I can use for this kind of analysis.
Any help will be greatly appreciated!

Thanks in advance,

Sungeun


Sungeun Chung, Ph.D. Associate Professor
Department of Journalism and Mass Communication
40210 Faculty Hall Sungkyunkwan University
53 Myeongyun-Dong 3-Ga Jongno-Gu, Seoul, Korea 110-745
82-02-760-0398; [hidden email]; [hidden email]