Dear allstat users.
In a SAS program.
the procedure was as following:
proc genmod data=ADJUST;
CLASS RID &X AGECAT4 BCSEASON BCBFEXCL BCGBCONI BCCROWD;
model &Y/days= &X AGECAT4 BCSEASON BCBFEXCL BCGBCONI BCCROWD /
dist=poisson
link=log;
REPEATED SUBJECT=RID/type=exch;
run;
where &y is a variable =1 if its an event and 0 if nonevent
and days is a person years of follow up.
and all the independent variables are numeric and no missing observations.
when I run the modle if the following log message:
567 proc genmod data=ADJUST;
568 CLASS RID &X AGECAT4 BCSEASON BCBFEXCL BCGBCONI BCCROWD;
569 model &Y/days= &X AGECAT4 BCSEASON BCBFEXCL BCGBCONI BCCROWD /
dist=poisson
570 link=log;
571 REPEATED SUBJECT=RID/type=exch;
572 run;
WARNING: The binomial response distribution is usually appropriate for a
ratio response variable.
NOTE: Non-integer response values have been detected for the POISSON
distribution.
NOTE: The scale parameter was held fixed.
ERROR: Error in computing the variance function.
NOTE: No convergence of GEE parameter estimates after 2 iterations.
NOTE: The scale parameter for GEE estimation was computed as the square root
of the normalized Pearson's chi-square.
NOTE: The PROCEDURE GENMOD used 41.13 seconds.
Can any one help me and explain the source of error and how i correct it.
Wait to hear from you.
Have a nice day.
*******************************************
Khaled El_Sayed Hassan, M.Phil
Demographer & Data Analyst
US Naval Medical Research Center No. 3 (NAMRU3)
Enteric disease Department
Advanced Study Unit
Tel: (202) 684-1375/6 Ext. 54
(202) 310-1082 (Home)
Cellular: (20) 12-285-9778
Fax: (202) 684-9625
E-mail: [log in to unmask]
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URL: http://khalid.cjb.net/
