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Re: st: Obtaining population estimates for multiply imputed survey data
From
Steve Samuels <[email protected]>
To
[email protected]
Subject
Re: st: Obtaining population estimates for multiply imputed survey data
Date
Mon, 14 May 2012 11:35:14 -0400
Good points, Richard.
I should have mentioned in my post that, independent of -mi estimate-, the validity of -svy: total- depends on the same conditions I mentioned for utilizing the sum of the weights as an independent estimate of population size. Elaborating slightly, the conditions are:
1) that weights be corrected for non-response or that non-response be very low
2) that the weights not be standardized to sum to sample size (a regrettable practice in my opinion)
3) that the design be appropriate: PPS should be OK.
Steve
[email protected]
On May 14, Richard Williams wrote
I don't know when it [-cmdok-] got added, but it is an option in Stata 11.2, which the original poster should be able to upgrade to.
My only hesitation in using -cmdok- with -total- is that I wonder if Stata had some good reason for not building in support to begin with. Whenever Stata surprises me, I am never sure if it is because (a) Stata is smarter than I am, or (b) somebody just hasn't gotten around to programming something yet.
On May 14, Steve Samuels wrote:
Also, -cmdok- was not an option in Stata 11. If it is not in Stata 11.1, Lauren
can -mi estimate- means and standard errors,then multiply these by an estimate
of population size N. If a good external estimate of N is available, I'd
recommend that. Also for many surveys an independent estimate is available: the the sum of the sample weights, corrected for non-response. This won't work if: 1) the weights were standardized to sum to sample size; or 2) the sample was drawn poorly, e.g. a SRS of unequally sized units was drawn at the first stage.
Steve
[email protected]
At 09:09 PM 5/13/2012, Stas Kolenikov wrote:
I'd say this is an oversight. There's nothing special to -total- that
would make it terribly different from other commands, so you should
just proceed with -cmdok- option of -mi estimate-.
Support for -total- was added in version 12. It does seem odd it wasn't supported before. Perhaps it could be double-checked against the -means- command to make sure it will work ok in Stata 11.
On Sun, May 13, 2012 at 11:24 AM, Lauren Pollack
<[email protected]> wrote:
I am using Stata 11.1 and trying to obtain population estimates for
multiply imputed survey data. My data is mi set and I am analyzing it
using the mi commands. It is survey data, so it is also svyset. I can
see that mi commands allow one to obtain proportions, ratios, and
means for survey data using the command structure "mi estimate: svy:
[proportion/mean/ratio]" but the command I really need to use is "svy:
total", to obtain population estimates. This is the command I use to
obtain population estimates for non-mi data. Is there any way to do
this using the mi commands? It's not listed as a supported command,
but I have to imagine there is some way of obtaining population
estimates for multiply imputed survey data.
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