Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

# Re: st: ratio of 2 different surveys estimates? svyset , suest , fpc , nlcom

 From Austin Nichols <[email protected]> To [email protected] Subject Re: st: ratio of 2 different surveys estimates? svyset , suest , fpc , nlcom Date Thu, 20 Jan 2011 12:43:28 -0500

```Steve--
This works for inference on a population that is the sum of the
populations in each of two years--a strange population for many
purposes.

On Thu, Jan 20, 2011 at 9:00 AM, Steven Samuels <[email protected]> wrote:
>
> "Is this statistically correct..?"
> Yes
>
> Steve
> [email protected]
>
>
> On Jan 20, 2011, at 4:03 AM, Roman Kasal wrote:
>
> ok, I understand that, I already did this once, but is this
> statistically correct adjusting=combine FPCs of two different surveys?
> What if the FPCs are really very different (this is not mentioned case)?
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Steven
> Samuels
> Sent: Wednesday, January 19, 2011 9:08 PM
> To: [email protected]
> Subject: Re: st: ratio of 2 different surveys estimates? svyset , suest
> , fpc , nlcom
>
> Another way of putting this: When you combine independent surveys, you
> must create a new stratum variable in which the individual original
> strata in each survey appear. You would do this in your data, for
> example by:
> ****************************
> egen stratum =group(year stk)
> *****************************
> If there were 10 strata in 2006 and 10 in 2007, the new stratum
> variable should have 20 levels. Then a single -svyset- statement will
> allow joint analysis of the two surveys, as in my example.
>
> Steve
> [email protected]
*
*   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/
```