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')

> 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')

> traceback()

7: model.frame.default(formula = y ~ xx, drop.unused.levels = TRUE)

6: model.frame(formula = y ~ xx, drop.unused.levels = TRUE)

5: eval(expr, envir, enclos)

4: eval(expr, p)

3: eval.parent(mf)

2: rq(y ~ xx, tau = 2:98/100)

1: summary(rq(y ~ xx, tau = 2:98/100))

 

 

Les Stanfield

Ministry of Natural Resources and 

University of Toronto, 

mail to: Glenora Fisheries Station, RR 4

Picton, On. K0K 2T0

M, T, (613)-476-8777

W, T, F (416)-946-7232

 


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