Hi, don' t understand why the function fomula have this error, i enclose
the parameter "a" with the function I()
Thank Ruben
x<-1:5
y<-c( 2 ,4 , 6 , 8 ,11)
formu<-y~I(a*x)
form<-formula(formu)
dummy<-data.frame(x=x,y=y)
fm<-lm(form,data=dummy)
Error in unique(c("AsIs", oldClass(x))) : Object "a" not found
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