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From |
Fernando Rios Avila <f.rios.a@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: weights in pooled repeated cross sections |

Date |
Tue, 27 Sep 2011 17:47:03 -0400 |

Steve I understand. Thanks for the advice and clarification. Fernando On Tue, Sep 27, 2011 at 5:40 PM, Steven Samuels <sjsamuels@gmail.com> wrote: > > Fernando- > > If, say, 90 PSUs repeated over four years, an analysis which ignored this would count them as 360 PSUs. The consequence would be standard errors and p-values that are too small. > > By the way, I have ignored this issue in past posts to Statalist, which recommended that "years" could (always) be crossed with the original strata to form new super-strata. I apologize for this incorrect advice. > > Steve > > > > > On Sep 27, 2011, at 4:37 PM, Fernando Rios Avila wrote: > > Hi Steven, > Since it seems you have experience with this kind of data, i wonder if > you know if there is any particular consequence of pooling and using > the weights as you mention when each individual survey is not > statistically independent from each other, meaning that some Primary > sample units may appear more than once through the different surveys, > while others wont. > Thanks! > > On Tue, Sep 27, 2011 at 4:35 PM, Nick Cox <njcoxstata@gmail.com> wrote: >> PSUs are primary survey units. >> >> Nick >> >> On Tue, Sep 27, 2011 at 9:32 PM, Steven Samuels <sjsamuels@gmail.com> wrote: >>> >>> 1. Pool >>> 2. Divide weights by four (would affect only totals, but still a good idea) >>> 3. -svyset- the whole thing. >>> >>> >>> Steve >>> >>> On Sep 27, 2011, at 10:40 AM, Ivica Rubil wrote: >>> >>> so, you're saying I just pool the 4 datasets, divide the weights by 4, >>> and apply -svyset- to the pooled dataset? Or should I rather use >>> -svyset- for each of the 4 datasets, pool them in one, and then divide >>> the weights by 4? >>> Further, sorry for bothering you: what are PSUs? How do I check if they >>> change form year to year? >>> >>> -- >>> Ivica Rubil >>> Ekonomski institut / The Institute of Economics, Zagreb >>> Trg J. F. Kennedyja 7, 10 000 Zagreb, Croatia >>> tel. +385-1-2362-269 >>> fax. +385-1-2335-165 >>> irubil@eizg.hr >>> www.eizg.hr >>> >>> >>> -----Original Message----- >>> From: owner-statalist@hsphsun2.harvard.edu >>> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Steven >>> Samuels >>> Sent: 27. rujan 2011 15:51 >>> To: statalist@hsphsun2.harvard.edu >>> Subject: Re: st: weights in pooled repeated cross sections >>> >>> >>> Ivica- >>> You can use the individual weights, Ivica, but divide by 4 so that they >>> sum to the average population total over the four years >>> >>> You still have to write the rest of the -svyset- command. If the PSUs >>> did not change over the four years, then treat the pooled sample as one >>> large sample, and use the same -svyset- statement that you would use for >>> a single year. If some PSUs changed you will have to do some stratum >>> recoding. For an example see >>> http://www.cdc.gov/nchs/ppt/nchs2010/46_Moriarity.ppt >>> >>> Steve >>> >>> On Sep 26, 2011, at 12:03 PM, Ivica Rubil wrote: >>> >>> Dear all, >>> >>> I am trying to pool four repeated cross-sections of Croatian Hpusehold >>> Budget Survey. >>> For each year that I want to pool, I have sampling weights for each >>> observation (both household and person). >>> My questions are: What should I do with the weights once I pool the four >>> datasets? Is it wrong to use >>> dataset-specific weights in the pooled dataset and just run estimation >>> commands with the weight option, if >>> available? I am confused. Please, help. >>> >> >> * >> * 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/ > > > * > * 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**:**FW: st: weights in pooled repeated cross sections***From:*"Ivica Rubil" <irubil@eizg.hr>

**Re: st: weights in pooled repeated cross sections***From:*Steven Samuels <sjsamuels@gmail.com>

**Re: st: weights in pooled repeated cross sections***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: weights in pooled repeated cross sections***From:*Fernando Rios Avila <f.rios.a@gmail.com>

**Re: st: weights in pooled repeated cross sections***From:*Steven Samuels <sjsamuels@gmail.com>

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