[R] polr model, out-of-sample probabilities

Prof Brian Ripley ripley at stats.ox.ac.uk
Fri Jan 11 08:48:22 CET 2013

On 11/01/2013 01:59, Alphan Kirayoglu wrote:
> Hi,
> Is there a function to calculate probabilities for new out-of-sample data
> once we fit a model using the in-sample data?
> predict(model, newdata=... ) seems to require the new data to be the same
> size as the original data used to fit the model.

It does not, so why do you assume so?

> In short, I would like to fit a model and then pass out-of-sample data to
> calculate probabilities.

That is what predict() is for.

Your subject line says 'polr model'.  Perhaps this was about my package 
MASS, but in any case please talk to the credit-where-credit-is-due 

And you could have seen this with a simple modification of the example 
on the help page for MASS::polr ....

> Regards,
> Alp
> 	[[alternative HTML version deleted]]
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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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