R help - Jun 2011 - (no subject)

Error in lda.default(x, grouping, ...) : 
  variables  1  3  5  8 10 15 17 20 27 29 34 appear to be constant within groups

what this sentence means??
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Ungku Akashah <kaslah90 at yahoo.com> [Thu, Jun 02, 2011 at 10:31:53AM
CEST]:
> Error in lda.default(x, grouping, ...) : 
>   variables  1  3  5  8 10 15 17 20 27 29 34 appear to be constant within
groups
Please do read the posting guide before posing a question here.
The message would have benefitted from a title. Mentioning the
package where the error occurred (hint: it doesn't seem to occur
within the package lda) would also have helped. Preparing a
minimal example where this message occurred would have made it 
easier for us to replicate the error message.
> what this sentence means??
Semantically, the sentence means that the values of the variables 
whose position in the data frame are given appear to be the same 
within all groups. That means that I'd expect something like

tapply(x, grouping. unique) 

would produce only one value per result.



-- 
Johannes H?sing               There is something fascinating about science. 
                              One gets such wholesale returns of conjecture 
mailto:johannes at huesing.name  from such a trifling investment of fact.
http://derwisch.wikidot.com         (Mark Twain, "Life on the
Mississippi")