Re: [R] formula and lm

From: Spencer Graves <spencer.graves_at_pdf.com>
Date: Fri 16 Jul 2004 - 06:02:00 EST

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

solares@unsl.edu.ar 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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R-help@stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Jul 16 06:09:40 2004

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