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From |
"Maurizio La Rocca" <[email protected]> |

To |
<[email protected]> |

Subject |
Re: msg for Statalist: "Which input for standard error in metaregression" |

Date |
Mon, 4 Jan 2010 17:15:35 +0100 |

Thanks a lot for your insights.

I installed the new version and I found the AdjR2 using metareg. One more question.

Thanks a lot and best regards Maurizio Maurizio La Rocca www.mauriziolarocca.it http://ssrn.com/author=363841 -------------------------------------------------- From: "Roger Harbord" <[email protected]> Sent: Monday, January 04, 2010 10:40 AM

Cc: <[email protected]>

Dear Maurizio:On Mon, Jan 4, 2010 at 8:41 AM, Maurizio La Rocca <[email protected]>wrote:I have a crucial doubt about the weights to use in a meta-regression. For fixed-effect I have to use this Stata command: vwls Y(effect size) DummyX1 DummyX2. Sd(StandardErrorEffectSize) For fixed-effect I have to use this Stata command, using reml- residual maximum likelihood - as option: metareg Y(effect size) DummyX1 DummyX2, wsse(StandardErrorEffectSize) bsest(reml) My doubt concerns the weight.If I compute a variance-weighted least squared regression do I have toinputin the stata command the Standard Error of the Effect Size or theinvertedsquared standard error?End running a metareg (random-effect), is it correct, in this case, theuseof the Standard Error of the Effect Size?You have the command syntax right: -vwls- and -metareg- take the standard error as argument to the sd() and wsse() options respectively. (Note that Stata is case-sensitive so it may object if you type "Sd" rather than "sd".)Moreover, I have a second doubt. Please, does anybody of you know how to compute R^2 after a variance-weighted least squared regression? Is it possible to compute it?The current version of -metareg- includes in the output an "adjusted R-squared" value that is computed as the percentage reduction in the (residual) between-study variance when covariates are fitted (compared to the random-effects meta-analysis model with no covariates). To install the latest version of -metareg- type "findit metareg" in Stata and click on the link labelled "sbe23_1", which is currently the fifth item down (at least in Stata 11 with the latest updates installed). Or if that doesn't work for you, try "net sj 8-4 sbe23_1". For further discussion of the updated version of -metareg- see: Harbord RM, Higgins JPT. Meta-regression in Stata. Stata Journal 2008; 8(4):493-519. <http://www.stata-journal.com/article.html?article=sbe23_1> Regards, Roger. -- Roger Harbordhttp://www.epi.bris.ac.uk/staff/rharbord.htm

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**Follow-Ups**:**Re: msg for Statalist: "Which input for standard error in metaregression"***From:*Roger Harbord <[email protected]>

**References**:**msg for Statalist: "Which input for standard error in metaregression"***From:*"Maurizio La Rocca" <[email protected]>

**Re: msg for Statalist: "Which input for standard error in metaregression"***From:*Roger Harbord <[email protected]>

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