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hyper
2007 Nov 03
0
rank-deficient model matrix
Dear:
I want to construct a gee model in R. When I ran the program, there was a warning in the output.
The warning is "Beginning Cgee S-function, @(#) geeformula.q 4.13 98/01/27
gee(cbind(hyper, nohyper) ~ I(Ethnic) + I(Gender) + I(drink) + :
rank-deficient model matrix"
What is the rank-deficient model matrix? What should I do to solve the problem?
Thanks all.
Lian
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