R help - Nov 2002 - hosmer-lemeshow

Hi eveybody.

I've seen posted before the same question, but no answer. Is there anybody
who has implemented the Hosmer-Lemeshow test in R?

TIA,

Stefano

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Have you checked out this reply from Prof. Harrell?  Looks like what you
need.

http://finzi.psych.upenn.edu/R/Rhelp02/archive/7788.html

Andy

-----Original Message-----
From: stecalza at tiscali.it [mailto:stecalza at tiscali.it]
Sent: Friday, November 22, 2002 11:38 AM
To: r-help at stat.math.ethz.ch
Subject: [R] hosmer-lemeshow


Hi eveybody.

I've seen posted before the same question, but no answer. Is there anybody
who has implemented the Hosmer-Lemeshow test in R?

TIA,

Stefano

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On Fri, 22 Nov 2002 17:37:55 +0100
stecalza at tiscali.it wrote:
> Hi eveybody.
> 
> I've seen posted before the same question, but no answer. Is there
anybody
> who has implemented the Hosmer-Lemeshow test in R?
> 
> TIA,
> 
> Stefano
> 
I think I've posted this before, but the H-L test has disadvantages: low
power, sensitive to arbitrary choices of intervals, other issues related to
testing the model on the training data.  The Hosmer-Le Cessie test is a one d.f.
omnibus test of lack of fit for a binary logistic model that will generally have
more power than H-L, and it does not require one to construct intervals of
predicted probabilities.  The new test is done by the residuals.lrm function in
the Design library (http://hesweb1.med.virginia.edu/biostat/s/Design.html). 
Like all omnibus tests, it will have low power against directed alternatives
(e.g., nonlinearity, nonadditivity).
-- 
Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat
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