On Tue, 2006-10-24 at 11:54 -0400, Stanfield, Les (MNR) wrote:
> I hope you can help me. I am new to "R" and am working through the
> example of quantile regression analysis in the paper by Roger Koenker
> (quantile regression in R: a Vignette. I got to page 6 and in trying to
> execute the following code I received the error below. I have searched
> on the web and while I have found similar error messages, I have not
> been able to ascertain the root cause. Any assistance would be
> appreciated. Basically, is this a bug in the program or in the coding,
> or does this function not work in the versions that I have downloaded.
> I have downloaded: R 2.4.0 and quantreg 4.0.1 and SparseM. Am I missing
> something?
>
>
>
> > xx <- x -mean(x)
>
> > fit1 <- summary(rq(y ~ xx, tau = 2:98/100))
>
> Error in model.frame(formula, rownames, variables, varnames, extras,
> extranames, :
>
> variable lengths differ (found for 'xx')
The error is indicating that the number of elements in 'y' is not the
same as in 'xx':
> y <- rnorm(50)
> xx <- rnorm(49)
> lm(y ~ xx)
Error in model.frame(formula, rownames, variables, varnames, extras,
extranames, :
variable lengths differ (found for 'xx')
Thus, check the nature of 'y' and 'xx':
> str(y)
num [1:50] -0.902 1.002 -1.064 2.630 2.193 ...
> str(xx)
num [1:49] 1.590 -2.354 0.166 0.332 -0.547 ...
And that should reveal the source of the error.
HTH,
Marc Schwartz
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