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From |
Steven Samuels <sjhsamuels@earthlink.net> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: lincom & svy commands |

Date |
Thu, 23 Oct 2008 16:01:25 -0400 |

Cluster Before-Mean After-Mean difference 1 5 4 1 2 10 8 2 3 15 11 4 4 20 16 4

-Steve On Oct 23, 2008, at 11:18 AM, Bell, Jacqueline S. wrote:

HiThis is a follow-on to a previous message I sent this month askingabout how lincom calculates standard errors when clustering ispresent.Can anyone advise me on what lincom actually does when estimatingdifferences in parameters from svy:mean or svy:prop?I have before/after data which is not paired at an individuallevel, but has a cluster structure. In these circumstances it isnot obvious how lincom goes about estimating the before/afterdifference.The two alternatives suggested to me are:i) it estimates before and after separately for the wholepopulation, then estimates the differenceii)it estimates the difference in each cluster, and then theoverall difference.In the data there are (in most cases) before and after data foreach cluster, but often quite severe imbalances in samples before/after within cluster.Thanks for any help, JacquiThe University of Aberdeen is a charity registered in Scotland, NoSC013683.* * 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/

* * 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/

**References**:**st: lincom & svy commands***From:*"Bell, Jacqueline S." <j.bell@abdn.ac.uk>

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