[R] Multinomial logistic regression with non-numerical data.

From: TL Vincent <tv3190_at_bristol.ac.uk>
Date: Thu, 24 Jul 2008 14:36:20 +0100

Hi all,

I have a set of data which looks similar to this (only way bigger!)

link type register

F         D         a
E         D         b
R         D         c
A         T         d
D         T         a
F         D         b

. . .
. . .

and would like to perform a multinomial logistic regression on this data. I use the nnet package and obtain the raw regression coefficients from the output when I enter:

summary(fit, Wald =T);

However, I am struggling to compute the regression results in terms of probabilities, my main barrier being the fact that my data is non-numerical. For example, I would like to fix a value "d" to register, and calculate the probability of choosing each link for both type "D" or "T" . I hope this was clear enough!
I appreciate your help!

Tom V.

TL Vincent
BCCS - Bristol Centre for Complexity Sciences

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