On Tue, 9 Dec 2008, John Sorkin wrote:
It appears that I have sinned and for this I surely will wear sack cloth and
grovel until my period of penitence is fulfilled.
I update R and my problem remains. Please see code snippet (as per posting
guidelines) below
R 2.8.0
windows XP
summary(data$AAMTCAREJ)
Min. 1st Qu. Median Mean 3rd Qu. Max.
1.0 404.3 1430.0 6567.0 5457.0 327900.0
fitglm<-glm(AAMTCAREJ~sexcat+H_AGE+SmokeCat+InsuranceCat+MedicadeCat+
+ incomegrp+racecat+MARSTATJS+EdCat+bmiNewjohn,data=data,family=Gamma(link =
"inverse"))
Error: no valid set of coefficients has been found: please supply starting
values
In addition: Warning message:
In log(ifelse(y == 0, 1, y/mu)) : NaNs produced
Well, this still isn't something others can _reproduce_ , but...
The error message seems to be from glm.fit().
I'd guess you are throwing glm() a knuckleball and it is choking on its
attempt to calculate the deviance - note the warning message.
You might be able to calm glm()'s frayed nerves by supplying some decent
start values as it is asking. Possibly starting with a subset of
variables, using the coef()s for the subset and setting the others to zero
when you attempt to fit all together will be enough to push it past its
sticking point.
HTH,
Chuck
John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
Prof Brian Ripley <[EMAIL PROTECTED]> 12/9/2008 2:11 PM >>>
On Tue, 9 Dec 2008, John Sorkin wrote:
R 2.5
Please
1) do as the posting guide asks, and quote version numbers accurately.
2) do as the posting guide asks, and update *before* posting.
That's too old a version to support here.
windows XP
I am getting an error from glm() that I don't understand. Any help or suggestions
would be appreciated. N.B. 1<=AAMTCAREJ<=327900
summary(data$AAMTCAREJ)
Min. 1st Qu. Median Mean 3rd Qu. Max.
1.0 404.3 1430.0 6567.0 5457.0 327900.0
fitglm<-glm(AAMTCAREJ~sexcat+H_AGE+SmokeCat+InsuranceCat+MedicadeCat+
+ incomegrp+racecat+MARSTATJS+EdCat+bmiNewjohn,data=data,family=Gamma(link =
"inverse"))
Error: no valid set of coefficients has been found: please supply starting
values
In addition: Warning message:
NaNs produced in: log(x)
That model is not necessarily valid: the linear predictor has to be
strictly positive. If you really know why it is applicable you will be
able to give starting values (e.g. maybe all the columns of the design
matrix are positive, in which case you will be able to find suitable
positive initial coefficients).
Thanks
John
John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
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
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
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http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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