On Oct 24, 2013, at 1:51 AM, Alexandra Kuznetsova wrote:
> Dear all,
>
> Running the following code produces an error in dummy.coef. I guess it might
> be a bug..
>
>> ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14)
>> trt <- c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69)
>> group <- gl(2, 10, 20, labels = c("Ctl","Trt"))
>> weight <- c(ctl, trt)
>> x <- rnorm(length(weight))
>> lm.D9 <- lm(weight ~ group + x + I(x^2))
>> dummy.coef(lm.D9)
> Error in rep.int(xl[[i]][1L], nl) : invalid 'times' value
As Rolf Turner pointed out the help page says there are limitations to that
function and its only desiged for specific purposes. What are you trying to
accomplish?
--
David Winsemius
Alameda, CA, USA
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