[R] No P.values in polr summary
Prof Brian Ripley
ripley at stats.ox.ac.uk
Sat Oct 19 08:35:03 CEST 2013
On 18/10/2013 15:01, Vincent Guyader wrote:
> Hi everyone,
> If I compute a "Ordered Logistic or Probit Regression" with the polr
> function from MASS package. the summary give me : coefficients, Standard
> error and Tvalue.. but not directly the p.value.
> I can compute "manualy" the Pvalue, but Is there a way to directly obtain
> the pa.value, and I wonder why the p.valeu is not directly calculated, is
> there a reason?
How are you going to calculate the P values? Have you read the book for
which this is support software?: it explains why such Wald tests are
inappropriate and that the asymptotic theory can be wildly misleading.
> exemple :
> house.plr <- polr(Sat ~ Infl + Type + Cont, weights = Freq, data = housing)
> summary(house.plr, digits = 3)
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> and provide commented, minimal, self-contained, reproducible code.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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