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From |
"Tom Trikalinos" <ttrikalin@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: 'Meta' and 'Metareg' Coefficients & CIs Differ |

Date |
Mon, 23 Jul 2007 20:12:11 -0400 |

In the absence of covariates _metareg_ does a random effects meta-analysis, indeed. However, with a different method than _meta_ (using the default settings for _metareg_): _metareg_ uses REML to get the tau^2 estimate (between study variance) _meta_ is using the DerSimonian and Laird method To get the same results use the following syntax: metareg beta , wsse(SE) mm z where mm--> uses the method-of-moments estimate for tau^2, aka the DerSimonian and Laird method z --> uses the z and not the t disrtibution to get the SE and the CIs tom On 7/23/07, Tiffany Davenport <tiffany.davenport@yale.edu> wrote:

I am using the 'meta' and 'metareg' commands for meta-analysis in Stata. As I understand it (and as previously posted) the pooled random effects estimate obtained by using the 'meta' command should be the same as the constant obtained in meta-regression analysis ('metareg') of a model with no covariates. I am finding that the values of these estimates as well as their confidence intervals differ slightly. I have entered the following syntax: "meta beta SE" - for the meta command and "metareg beta, wsse(SE)" for the meta-regression command 1. Shouldn't the pooled random effects estimate from 'meta' be the same as the coefficient for the constant from 'metareg,' and shouldn't the confidence intervals be the same? If not, I would appreciate any insight into why the two commands would generate different estimates with different standard errors. Are they weighted differently? Are adjustments to the syntax of either command necessary to ensure the intercepts and confidence intervals match? 2. Is it possible to display more decimal places in the 'meta' output? Thanks very much for any help. * * 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: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: 'Meta' and 'Metareg' Coefficients & CIs Differ***From:*"Tom Trikalinos" <ttrikalin@gmail.com>

**References**:**st: 'Meta' and 'Metareg' Coefficients & CIs Differ***From:*"Tiffany Davenport" <tiffany.davenport@yale.edu>

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