Lynne -
I spoke too quickly concerning quality weights... metan does offer a wgt() option where user-defined weights can be used to combine
studies. When using wgt(), you must incorporate all weightings yourself, quality, sample sizes, etc., into a single set of weights
and must manually compute the effect size; none of the internal effect size or weight computation features are available (but you
can do a preliminary run to capture these values then use them to create the needed variables).
Tom
Thomas J. Steichen
[email protected]
----------------------------------------------------------------------------
Facts do not cease to exist because they are ignored. - Aldous Huxley
----------------------------------------------------------------------------
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> [email protected]
> Sent: Thursday, July 07, 2005 3:32 PM
> To: [email protected]
> Subject: st: RE: RE: How to add weighting variables in meta-analysis
>
>
> Thanks!
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> Steichen, Thomas J.
> Sent: Thursday, July 07, 2005 11:50 AM
> To: [email protected]
> Subject: st: RE: How to add weighting variables in meta-analysis
>
> Lynne,
>
> A command line such as "metan tdeath tnodeath cdeath
> cnodeath, or" IS weighted by sample size(s)!
>
> Such a command will take into account the number of subjects
> (as you have specified the exact number in the treated and
> control groups for each study).
>
> There is no weighting feature in metan for study quality (but
> perhaps this will be considered when metan is rewritten for Stata 9).
>
> Tom
>
> Thomas J. Steichen
> [email protected]
> --------------------------------------------------------------
> --------------
> Facts do not cease to exist because they are ignored. -
> Aldous Huxley
> --------------------------------------------------------------
> --------------
>
>
>
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]] On Behalf Of
> McFarland,
> > Lynne V
> > Sent: Thursday, July 07, 2005 11:31 AM
> > To: '[email protected]'
> > Subject: st: How to add weighting variables in meta-analysis
> >
> >
> > An additional question to all you brilliant people about meta
> > analysis. How do you write into the command a variable that weights
> > various Studies for sample size or quality?
> > Given a command line: .metan tdeath tnodeath cdeath cnodeath, or
> > If I want to add a variable sizei ? And/or quali ?
> >
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]] On Behalf Of Michael
> > McCulloch
> > Sent: Tuesday, July 05, 2005 10:54 PM
> > To: [email protected]
> > Subject: Re: st: A question about meta-analysis
> >
> > Yes, the *metan* command will perform meta-analysis using simply the
> > four cells of the 2x2 table such as you describe.
> > Type *help metan* to see the many many options available to you. If
> > you want to perform meta-analysis of failure (instead of
> cure) simply
> > subtract:
> > #treated - # cured = # failed Michael
> >
> >
> > At 03:54 PM 7/5/2005, you wrote:
> > >I am trying to do a meta-analysis for the first time with
> a series Of
> > >older randomized trials. The only results that are provided
> > in #cured
> > >in treated/#treated vs #cured in controls/#controls and a
> > Ttest or chi
> > >squared. Without having OR and 95% CI or even std
> errors,can I do a
> > >Meta-analysis in Stata ?
> > >
> > >Can anybody with any experience help guide a poor Stata
> > Virgin through
> > this?
> > >Or at least tell me if I'm barking up the wrong tree!
> > >
> > >Thank in Advance, hope everyone had a great July 4th and
> > didn't blow up
> > >Their BBQ!
> > >*
> > >* 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/
> >
> >
> > Best wishes,
> > Michael
> >
> >
> > ____________________________________
> >
> > Michael McCulloch, LAc, MPH
> > Pine Street Clinic
> > 124 Pine Street, San Anselmo, CA 94960-2674
> > tel 415.407.1357
> > fax 415.485.1065
> > email: [email protected]
> > web: www.pinest.org
> > www.pinestreetfoundation.org
> >
> >
> >
> >
> >
> > *
> > * 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:
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> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> >
>
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