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From | Austin Nichols <austinnichols@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
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 <sjsamuels@gmail.com> wrote: > > "Is this statistically correct..?" > Yes > > Steve > sjsamuels@gmail.com > > > 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: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Steven > Samuels > Sent: Wednesday, January 19, 2011 9:08 PM > To: statalist@hsphsun2.harvard.edu > 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 > sjsamuels@gmail.com * * 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/