[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
Roger Harbord <[email protected]> |

To |
[email protected], Maurizio La Rocca <[email protected]> |

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

Date |
Mon, 4 Jan 2010 09:40:38 +0000 |

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 to input > in the stata command the Standard Error of the Effect Size or the inverted > squared standard error? > End running a metareg (random-effect), is it correct, in this case, the use > of 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 Harbord http://www.epi.bris.ac.uk/staff/rharbord.htm * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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

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

- Prev by Date:
**st: Missing chi squared in negative binomial** - Next by Date:
**st: Two-way anova vs linear regression: how can I understand Partial SS** - Previous by thread:
**msg for Statalist: "Which input for standard error in metaregression"** - Next by thread:
**Re: msg for Statalist: "Which input for standard error in metaregression"** - Index(es):

© Copyright 1996–2024 StataCorp LLC | Terms of use | Privacy | Contact us | What's new | Site index |