Re: st: Kruskal-Wallis equivalent for survey data with pweight

[Steven Samuels <sjhsamuels@earthlink.net>]

||

I don't believe that -sts test- is -svy- enabled, but -stcox- is.  - 
stcox- is based on ranks of the observations and so is non-parametric  
in that way.  With indicator-variables for groups, -stcox- will  
perform the equivalent of the log-rank test for equality of  
distributions, not the Kruskal-Wallis test. With -stcox- you can add  
interactions of group x time (or log(time). This makes it possible to  
test for crossing distribution curves.

-Steve
On Oct 31, 2008, at 5:24 AM, Maarten buis wrote:

> --- "Aca N.T." <acant29@gmail.com> wrote:
> > I have a simple question about testing length of stay (LOS)
> > differences among 5 groups. The response variable (LOS) has a skewed
> > distribution. I have previously transformed the LOS (log
> > transformation) and tried parametric statistic (ANOVA using
> > svy:regress), but not happy when performing back-transformation for
> > SD/SE. I rarely used non-parametric statistics before even for
> > non-survey data, so really this issue is a hassle for me. I believe,
> > however, that Stata has a test equivalent to Kruskal-Wallis for
> > survey data.
>
> The conventional way of analysing length of stay data is using  
> survival
> analysis. So I would -stset- the data, and than use -sts test- to do
> the test. You can specify weights in the -stset- command. See:
> -help stset- and -help -sts test-.
>
> Hope this helps,
> Maarten
>
>
>
>
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room N515
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
>
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