Hi:

On Mon, Sep 6, 2010 at 5:26 PM, juan xiong <xiongjuan2000@gmail.com> wrote:

> Maybe Friedman test
>

The Friedman test corresponds to randomized complete block designs, not
general two-way classifications. David's advice is sound, but also
investigate proportional odds models (e.g., lrm in Prof. Harrell's rms
package) in case the 'usual' approach comes up short. It would be helpful to
know the number of response categories and some idea of the number of
cities-of-birth under study, though...

HTH,
Dennis


> On Mon, Sep 6, 2010 at 4:47 PM, David Winsemius <dwinsemius@comcast.net
> >wrote:
>
> > The usual least-squares methods are fairly robust to departures from
> > normality. Furthermore, it is the residuals that are assumed to be
> normally
> > distributed (not the marginal distributions that you are probably looking
> > at) , so it does not sound as though you have yet examined the data
> > properly. Tell us what the descriptive stats (say the means, variance,
> 10th
> > and 90th percentiles) are on the residuals within cells cross-classified
> by
> > the gender and city-of-birth variables (say the means, variance, 10th and
> > 90th percentiles).
> >
> >
> > On Sep 6, 2010, at 4:34 PM, Iasonas Lamprianou wrote:
> >
> >
> >> Dear friends, two questions
> >>
> >> (1) does anyone know if there are any non-parametric equivalents of the
> >> two-way ANOVA in R? I have an ordinal non-normally distributed dependent
> >> variable and two factors (gender and city of birth). Normally, one would
> try
> >> a two-way anova, but if R has any non-parametric equivalents, that might
> be
> >> great.
> >>
> >
> > There is an entire task view page on robust methods if you decide to
> press
> > on with this quest.
> >
> >
> >  (2) Also, if the interaction of gender and city of birth is
> statistically
> >> significant, which post-hoc tests should I run?
> >>
> >
> > How many cities are we talking about?
> >
> >
> >  Thanks
> >>
> >> Jason
> >>
> >>
> >> Dr. Iasonas Lamprianou
> >>
> >
> > --
> >
> > David Winsemius, MD
> > West Hartford, CT
> >
> >
> > ______________________________________________
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> > and provide commented, minimal, self-contained, reproducible code.
> >
>
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>
> ______________________________________________
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>

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