--- Richard Palmer-Jones <[email protected]> wrote:
> Thanks - I did check using summarize with weights, and other tests
> (sktest), and qnorm/pnrom, and generally skewness is no problem, but
> for some subsamples it may be. I am jconcerned that stratification
> is lost by these views.
It looks like you are worried about normality assumptions. This worries
me for two reasons: First, these assumptions typically refer to the
residuals, and not the dependent variable (or in other words the
dependent variable is normally distributed conditional on the
explanatory variables). Your reference to subsamples suggests that you
are not looking at the residuals. Second, when you are doing survey
methods, you are automatically using robust/Huber/White/sandwich
estimators, so you are effectively bypassing many if not all the
normality assumptions.
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/
-----------------------------------------
*
* 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/
