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2009 Nov 16
1
object not found inside step() function
...paste("y~1+",paste(grep("X.*",names(a)[force.in],value=T),collapse="+"),sep="")
} else
{lowmo<-"y~1"}
lower1<-glm(lowmo,family="binomial",data=data.frame(a,y))
upper1<-glm(form,family="binomial",data=data.frame(a,y))
stepout<-step(lower1,scope=list(lower=lower1,upper=upper1),direction="forward",k=0,trace=100)
# here is the error:Start:
#AIC=689.62
#y ~ 1
#Error in data.frame(a, y) : object 'a' not found---but "a" is there!
:
:
:
}
Sincerely
samer yuan
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