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# Re: st: weights in pooled repeated cross sections

 From Nick Cox <[email protected]> To [email protected] Subject Re: st: weights in pooled repeated cross sections Date Tue, 27 Sep 2011 21:35:29 +0100

```PSUs are primary survey units.

Nick

On Tue, Sep 27, 2011 at 9:32 PM, Steven Samuels <[email protected]> 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
> [email protected]
> www.eizg.hr
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Steven
> Samuels
> Sent: 27. rujan 2011 15:51
> To: [email protected]
> 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.
>

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