[R] nls (nlrq) boxcox

Johannes Ludsteck johannes.ludsteck at wiwi.uni-regensburg.de
Wed Nov 19 18:08:46 CET 2003

Dear r-help members
I am a newby to R and would like to estimate a simple boxcox 
model, e.g.
 (y^t - 1)/t ~ b0 + b1 * x1 + b2 * x2
unfortunately, R returns with an error message when I try to 
perform this with the call
nls( (y^t - 1)/t ~ b0 + b1 * x1 + b2 * x2, start = 
c(t=1,b0=1,b1=0,b2=0), data = mydataframe)

The error message is  Object "t" not found

Apparently R seems not to accept parameters on the left hand
side of a regression model. I know that the do-it-yourself
strategy is not necessary, since the package box-cox is 
available. Unfortunately, I want the use the box-cox 
transformation in a quantile regression, i.e. I have to replace 
nls by nlrq in the call above.

Any suggestions?

Thanks and best regards,
	Johannes Ludsteck
Johannes Ludsteck
Economics Department
University of Regensburg
Universitaetsstrasse 31
93053 Regensburg
Phone +49/0941/943-2741

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