Re: st:meta-analysis

 From Tom Trikalinos To statalist@hsphsun2.harvard.edu Subject Re: st:meta-analysis Date Fri, 3 Sep 2004 11:56:39 +0300

Generally speaking, if you want to check whether any factor(s) X1 (X2...) affect(s) Theta (ie the Effect Size), a meta-regression framework is probably warranted:
Try using _metareg_ and check the documentation.

. findit metareg

. metareg Theta X1 X2, wsse(seTheta)

Really advanced analysis would be based on Bayesian approaches and is relatively easily implemented in WinBUGS (free specialist software, try googling it). Lots of papers in Stat Med on Bayesian meta-analysis.

Hope this helps,

Tom

On Sep 3, 2004, at 11:11 AM, cui liwei wrote:

thanks Tom, but I still want to know if the sample size will affect the results.
you see, the "meta" doesn't take into account the "n".

input n theta se_theta
18 4.37 1.0740
18 3.13 1.5602
20 3.51 1.8622
21 3.34 1.9122
18 4.25 .60029
end

meta theta se_theta

From: Tom Trikalinos <ttrikalin@mac.com>
To: statalist@hsphsun2.harvard.edu
Subject: Re: st:meta-analysis
Date: Tue, 31 Aug 2004 11:59:48 +0300

I suppose you know what you're doing;
. findit metan
OR
.findit meta

yields useful routines. Use Coef values as the effect size (Theta) and the SE thereof as SE_theta.

Good luck

Tom

On Aug 31, 2004, at 11:44 AM, cui liwei wrote:

Dear all,

Here are the results of several regress,how to perform meta-analysis.
thanks!

Obs Coef. Std.Err. t P>|t|
18 4.37 1.0740 4.07 0.001
18 3.13 1.5602 2.01 0.062
.
.
18 4.25 .60029 7.08 0.000

Cui

_________________________________________________________________
~~{SkA*;z5DEsSQ=xPP=;Aw#,GkJ9SC~~} MSN Messenger: http://messenger.msn.com/cn
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
_________________________________________________________________
~{SkA*;z5DEsSQ=xPP=;Aw#,GkJ9SC~} MSN Messenger:  http://messenger.msn.com/cn
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/