It wants to compute a*x given a and x, and then use ordinarly least
squares to estimate b0 and b1 in y = b0 + b1*I(a*x). If that is what
you intend, you must supply a. If you want to estimate a, e.g., with no
constant, use y~x-1. Does this answer the question? hope this
helps. spencer graves
[EMAIL PROTECTED] wrote:
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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