I am trying to use logistic regression, but when i execute the following line of code
betaHatNorm=mnrfit(data,class);
my betaHatNorm contains mostly Nan, any resaon it might do so? it also throws a warning regarding matrix
Warning: Matrix is singular to working precision.

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Peter Perkins
Peter Perkins 2012-6-11

0 个投票

What most people mean by "logistic tregression" is a binomial response: number of "successes" vs. number of "failures". Unless you specifically need to fit a model for a multinomial response (more than just two response categories), I'd suggest you use glmfit.

3 个评论

Thank you for the response. What is the reason for using glmfit?
"Unless you specifically need to fit a model for a multinomial response ..." mnrfit is both more and less general than glmfit, but it is simpler to use glmfit for (binomial) logistic regression.
I am doing multinomial response using mnrfit.
I am getting the same warning.
How can I fix this?
Thanks.

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