Hong <[email protected]> asks about comparing multiple means from survey data:
> How about the question 2 of Robert? Below is the question:
>
> >2 - Is it possible to estimate a one-way anova to detect group differences
> > with svy commands in Stata 8 based on my above example?
>
> In Robert's example, variable x has three categories: 0, 1, and 2. Is there
> any way to compare the three group differences concurrently (like a one-way
> anova) with svy commands?
I believe this can be accomplished using either -svymean- or -svyregress- with
-test-. Here is an example, using the auto data:
. sysuse auto, clear
. svyset, srs
. keep if rep>2
. quietly svymean mpg, by(rep)
. test [mpg]3=[mpg]4=[mpg]5
. quietly xi : svyregress mpg i.rep
. test ([#1])
Here are the results from the above code:
***** BEGIN:
. sysuse auto, clear
(1978 Automobile Data)
. svyset, srs
simple random sample (SRS)
. keep if rep>2
(10 observations deleted)
. quietly svymean mpg, by(rep)
. test [mpg]3=[mpg]4=[mpg]5
Adjusted Wald test
( 1) [mpg]3 - [mpg]4 = 0
( 2) [mpg]3 - [mpg]5 = 0
F( 2, 57) = 5.12
Prob > F = 0.0090
. quietly xi : svyregress mpg i.rep
. test ([#1])
Adjusted Wald test
( 1) _Irep78_4 = 0
( 2) _Irep78_5 = 0
F( 2, 57) = 5.12
Prob > F = 0.0090
***** END:
--Jeff
[email protected]
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