R help - Mar 2005 - p values when using rlm

R 2.0.1
Linux
 
I am using rlm() to fit a model, e.g. fit1<-rlm(y~x). My model is more
complex than the one shown.
 
When I enter summary(fit1) 
I get estimates for the model's coefficients along with their SEs, and
t values, but no p values. The p value column is blank.
Similarly, when I enter anova(fit1) I get DF, Sum Sq, Mean Sq, but the
column for F value and Pr(>F) are blank. 
 
Any suggestions that will allow me to get the p values for summary, the
F and p values for anova?
Thanks,
John
 
 
John Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
Baltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC
 
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
 
410-605-7119 
- NOTE NEW EMAIL ADDRESS:
jsorkin@grecc.umaryland.edu

	[[alternative HTML version deleted]]

On Sat, 2005-03-26 at 20:36 -0500, John Sorkin wrote:
> R 2.0.1
> Linux
>  
> I am using rlm() to fit a model, e.g. fit1<-rlm(y~x). My model is more
> complex than the one shown.
>  
> When I enter summary(fit1) 
> I get estimates for the model's coefficients along with their SEs, and
> t values, but no p values. The p value column is blank.
> Similarly, when I enter anova(fit1) I get DF, Sum Sq, Mean Sq, but the
> column for F value and Pr(>F) are blank. 
>  
> Any suggestions that will allow me to get the p values for summary, the
> F and p values for anova?
> Thanks,
> John
John,

Perhaps these two posts may be of help to you:

http://tolstoy.newcastle.edu.au/R/help/04/10/5260.html

http://tolstoy.newcastle.edu.au/R/help/04/10/5252.html

I also located via a Google search the f.robftest() function in the
'sfsmisc' package on CRAN:

http://finzi.psych.upenn.edu/R/library/sfsmisc/html/f.robftest.html

but I would have to defer to the respective authors as to the pros and
cons of any of these approaches.

HTH,

Marc Schwartz