[R] Problem with Kruskal–Wallis test
bgunter@4567 @ending from gm@il@com
Tue Dec 25 16:22:10 CET 2018
"So, I'm not an expert in R and statistics" ....
So you need to seek local help from someone who is. Statistics is usually
off-topic for this list -- it is about R programming primarily. And online
is probably not a good venue for the sort of discussion you need anyway.
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, Dec 25, 2018 at 5:37 AM Giuseppe Cillis <giucillis using gmail.com> wrote:
> Dear Michael,
> Thanks for your answer.
> So, I'm not an expert in R and statistics, how can I create this interval
> of confidence of groups?
> Il giorno sab 22 dic 2018, 13:34 Michael Dewey <lists using dewey.myzen.co.uk>
> > Dear Giuseppe
> > If I understand you correctly you have a very large sample size so it is
> > not surprising that you get very small p-values. Eevn a scientifically
> > uninteresting difference can become statistically significant with large
> > samples. You probably need to define a metric for meaningful differences
> > between groups and calculate a confidence interval for it.
> > Michael
> > On 21/12/2018 15:37, Giuseppe Cillis wrote:
> > > Dear all,
> > > I am a beginner with R (and also with the statistics) for which I hope
> > > be clear.
> > > I should do this non-parametric test on data I extracted from maps.
> > > In practice I have a column that represents the landscape Dynamics of a
> > > certain time period (there are 3 dynamics, each of them marked by the
> > > number 1, 2 or 3) and the other column with the values of a topographic
> > > variable (for example the slope) . In all, there are more than 90,000
> > pairs
> > > of values.
> > > Going to do the test in R, for all the dynamics and for all the
> > variables,
> > > I get out of the values of chi-square elevated (even in the order of
> > > thousands) and a p-value always <2.2e-16 .... why? Where can the error
> > be? in
> > > the script or in the test approach?
> > > Thanks in advance
> > >
> > > [[alternative HTML version deleted]]
> > >
> > > ______________________________________________
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> > > PLEASE do read the posting guide
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> > > and provide commented, minimal, self-contained, reproducible code.
> > >
> > --
> > Michael
> > http://www.dewey.myzen.co.uk/home.html
> [[alternative HTML version deleted]]
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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