[R] meaning of error message about collinearity
ramasamy at stats.ox.ac.uk
Fri Jul 12 22:07:32 CEST 2002
Just a quick question. I am trying to fit an LDA model with a restricted
subsample. My X is a numerical matrix and Y is vector of factor response.
fit _ lda( Y[1:50] ~ X[1:50, ] )
gives the following error message: variables are collinear in:
lda.default(x, grouping, ...)
I am guessing this is the problem of rank deficiency as I have about 80
variable. [since the lda works with subsample of size 80 and above]
Q1: Is my interpretation of the error message correct ?
Q2: I am using the fit to prediction purposes etc. Is this likely to be
affected. ie how serious is this problem ?
Q3: Is there a good website about sound statistical theory/practical of
overcoming problem of rank deficiency if this is indeed the source of the
Many thanks, Adai.
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
More information about the R-help