[R] summary polr

[Prof Brian Ripley]

That's not it (the function is 'coef' not 'coeff', and R can tell 
functions and lists apart).

If you read the help page for polr you will see you could have used 
Hess=TRUE.  It works then.  THAT is why we needed an example, to see how 
you used the function.

On Tue, 20 Feb 2007, Michael Dewey wrote:

> At 14:41 20/02/2007, you wrote:
> Please do not just reply to me,
> 1 - I might not know
> 2 - it breaks the threading
>
>> Hi
>>
>> here there is an example extracted from polr help in MASS:
>>
>> The function could be:
>>
>>        temp <- function(form, dat) {
>>                     house.plr <- polr(formula =
>> form, weights = Freq, data = dat)
>>                     coeff <- summary(house.plr)
>>        return(coeff)}
>
> Why do you try to redefine the coeff extractor function?
> Try calling the results of summary summ or some
> other obvious name and I think you will find the problem goes away.
>
> See also
> > library(fortunes)
> > fortune("dog")
>
> Firstly, don't call your matrix 'matrix'. Would you call your dog 'dog'?
> Anyway, it might clash with the function 'matrix'.
>    -- Barry Rowlingson
>       R-help (October 2004)
>
>
>
>> the function can be called by:
>>
>>       temp(Sat ~ Infl + Type + Cont, housing)
>>
>> where all data is available from MASS, as it is
>> an example in R Help on 'polr'.
>>
>> Results are:
>>
>>        Re-fitting to get Hessian
>>
>>        Error in eval(expr, envir, enclos) : object "dat" not found
>>
>> Paolo Accadia
>>
>>
>>>>> Michael Dewey <info at aghmed.fsnet.co.uk> 20/02/07 1:43 PM >>>
>> At 15:21 19/02/2007, Paolo Accadia wrote:
>>> Hi all,
>>>
>>> I have a problem to estimate Std. Error and
>>> t-value by “polr† in library Mass.
>> s.
>>> They result from the summary of a polr object.
>>>
>>> I can obtain them working in the R environment
>> with the following statements:
>>>
>>>      temp <- polr(formula = formula1,  data = data1)
>>>      coeff <- summary(temp),
>>>
>>> but when the above statements are enclosed in a
>>> function, summary reports the following error:
>>>
>>> Error in eval(expr, envir, enclos) : object "dat" not found
>>>
>>> Someone knows how I can solve the problem?
>>
>> By giving us a short reproducible example?
>>
>> Specifically we do not know:
>> 1 - what formula1 is
>> 2 - what the structure of data1 is
>> 3 - what the enclosing function looks like
>> 4 - what dat is
>>
>>
>>> Thanks for any help.
>>> Paolo
>>
>> Michael Dewey
>> http://www.aghmed.fsnet.co.uk
>
> Michael Dewey
> http://www.aghmed.fsnet.co.uk
>
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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