Re: st: svyset

[Steve Samuels <sjsamuels@gmail.com>]

We didn't answer Rebecca's original question about the number of PSUs:

"
>  I noticed that units = 191 instead of 200 (as
> in the survey report) in one file of the dataset and units = 209 in
> another file of the datset.
> 
> Are these differences plausible or not?\


The discrepancies are disturbing. I can think of several reasons why the
file difference might occur, including a miscoding or renaming of PSU.
If you have access to the "other" file, you might check if the number of
respondents is the same. I'm not sure what you mean about "another file
of the dataset"; do you mean another "copy"? A file with different
variables? In any case, one way to solve this mystery is to write to the
study authors.

Steve

> From	  Rebecca Pietrelli <rebecca.pietrelli@gmail.com>
> To	  statalist@hsphsun2.harvard.edu
> Subject	  st: svyset command
> Date	  Wed, 31 Oct 2012 13:07:22 +0100
>  
> Hi,
> 
> I am using the Stata command svyset in order to declare the survey
> design for my dataset.
> (Uanda Migration Housolds Survey 2010).
> 
> The sample design is two-stage stratified: in the first stage
> enumeration areas -ea (psus) were selected, separately for rural and
> urban areas, and in the second stage households were selected in each
> ea, using a systematic procedure (4 hhs with international migrants, 3
> with internal migrants and 3 without migrants).
> 
> I used the following command:
> svyset psu_var [pw=hhweights_var], strata(strata_var)
> 
> and then (using svydes) I noticed that units = 191 instead of 200 (as
> in the survey report) in one file of the dataset and units = 209 in
> another file of the datset.
> 
> Are these differences plausible or not?
> Or do they mean that I wrong the svyset command?
> I am not sure if the first stage is with or without replacement (It is
> not mentioned in the report).
> 
> Thank you very much for any help.
> Rebecca
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/