[R] [Q] Goodness-of-fit test of a logistic regression model using rms package

2010-09-01 Thread GMail (KU)
Hello, I was looking for a way to evaluate the goodness-of-fit of a logistic regression model. After googling, I found that I could use resid(fit, 'gof') method implemented in the rms package. However, since I am not used to the le Cessie-van Houwelingen normal test statistic, I do not know

Re: [R] [Q] Goodness-of-fit test of a logistic regression model using rms package

2010-09-01 Thread Frank Harrell
On Wed, 1 Sep 2010, GMail (KU) wrote: Hello, I was looking for a way to evaluate the goodness-of-fit of a logistic regression model. After googling, I found that I could use resid(fit, 'gof') method implemented in the rms package. However, since I am not used to the le Cessie-van

Re: [R] [Q] Goodness-of-fit test of a logistic regression model using rms package

2010-09-01 Thread Bert Gunter
... and, furthermore, in most real world situations there are several -- or even lots -- of quite different, incomparable models that give essentially equivalent fits. Distinguishing among the alternatives typically requires focused studies designed for the task. Indeed, as Brian Joiner remarked