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RE: st: Meta regression


From   "Long Nguyen" <long@drnguyen.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Meta regression
Date   Mon, 14 May 2007 18:16:19 -0400

Thank you, Olalekan, for your quick response!!!
This looks like very good resource...  I'll check them out.

Long


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Olalekan Uthman
Sent: Monday, May 14, 2007 4:30 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Meta regression

You can get some help from these sites

http://www.blackwellpublishing.com/medicine/bmj/systreviews/pdfs/chapter18.p
df


http://www.medepi.net/meta/software/Bradburn_metan_updates.pdf

Olalekan Uthman

--- Long Nguyen <long@drnguyen.org> wrote:

> Hi, 
> 
> I'm a new user of STATA and trying to perform a meta
> regression.  I would
> appreciate some detail instruction and examples or
> tutorials that can help
> me do meta regression using this new tool.  I have
> the Getting Started..
> Manual and installed the metareg module; however,
> the online help file
> offered only limited information.
> 
> Thank you for your kind assistance,
> 
> Long
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On
> Behalf Of Brian P. Poi
> Sent: Monday, May 14, 2007 11:03 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: Different numbers of observations
> in sureg
> 
> On Mon, 14 May 2007 09:16:36 -0400 Alemu Mekonnen
> wrote:
> 
> > I would like to use different number of
> observations in the different 
> > equations when using the seemingly unrelated
> regression command in stata 
> > (i.e., sureg). For example, if there are two
> equations, I wanted to use 
> > 600 observations for equation 1 and 900
> observations for equation 2. My 
> > question is how do I limit the number of
> observations to do this. I was 
> > not able to use the IF command but this applies to
> all the equations in 
> > the system.
> 
> Alemu,
> 
> Allen McDowell illustrates a clever way of fitting
> the SUR model with 
> unequal numbers of observations by using the -xtgee-
> command in a "From 
> the help desk" article in the Stata Journal (vol. 4,
> no. 4).
> 
> The trick is to recognize that the SUR model
> 
>     y1 = x1 * b1 + u1
>     y2 = x2 * b2 + u2
> 
> can be "stacked" and written as
> 
>     [ y1 ] = [ x1  0 ][ b1 ] + [ u1 ]
>     [ y2 ]   [  0 x2 ][ b2 ] + [ u2 ]
> 
> The stacked version looks just like a panel data
> model with two panels. 
> One thing to note is in a SUR model, u1 and u2 are
> allowed to have 
> different variances, while -xtgee- assumes they have
> a common variance. 
> McDowell's article shows how to rescale the data
> using OLS regression and 
> how to manipulate your dataset to use with -xtgee-. 
> Then to fit the model 
> you simply use -xgee- with a Gaussian distribution,
> identity link 
> function, and an unstructured correlation matrix.
> 
>     -- Brian Poi
>     -- bpoi@stata.com
> 
> 
> Reference
> ------------
> McDowell, A.W. (2004). From the help desk: Seemingly
> unrelated regression
>     with unbalanced equations.  Stata Journal, 4(4):
> 442-448.
> 
> 
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