Hi R,
I am getting this error while trying to use 'lrm' function with nine
independent variables:
> res =
lrm(y1994~WC08301+WC08376+WC08316+WC08311+WC01001+WC08221+WC08106+WC0810
1+WC08231,data=y)
singular information matrix in lrm.fit (rank= 8 ). Offending
variable(s):
WC08101 WC08221
Error in j:(j + params[i] - 1) : NA/NaN argument
Now, if I take choose only four independent variables then there is no
error.
> res = lrm(y1994~ WC08221+WC08106+WC08101+WC08231,data=y)
But strangely, if I use 'glm', with the family as binomial(logit) and
with the same dataset, it is working perfectly fine.
> res =
glm(y1994~WC08301+WC08376+WC08316+WC08311+WC01001+WC08221+WC08106+WC0810
1+WC08231,data=y,family=binomial(logit))
Any ideas..?
Regards
Utkarsh
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