Lynne,
As I mentioned, you will need to compute the effect size estimates (I'll call that variable "est" for the following example) and the
weights (call it "wt") yourself.
Then you can use a command like the following:
. metan est est, wgt(wt)
Metan will only use the first input variable (but requires two legitimate variable names before the comma because of a programming
oversight) and will combine the estimates using the weightings define by the variable given in wgt(), i.e., wt.
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: Friday, July 08, 2005 11:25 AM
> To: [email protected]
> Subject: st: RE: RE: RE: RE: How to add weighting variables
> in meta-analysis
>
>
> Tom,
> Thanks for the clarification. So, after hand calculating a
> weight/study, Where do you plug that into a meta command?
> Does it become A 5th variable before the options or is it
> added as an option and how?
>
> Still confused.
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> Steichen, Thomas J.
> Sent: Friday, July 08, 2005 6:09 AM
> To: [email protected]
> Subject: st: RE: RE: RE: How to add weighting variables in
> meta-analysis
>
> 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
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> > > *
> > > * 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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