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 <[EMAIL PROTECTED]> 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 âpolrâ 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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