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dichotomous
2005 Sep 13
1
logistic regression with nominal predictors
...he gain of logistic regression over
odds ratios when none of the input variables is continuous.
My experiment:
Outcome: ordinal scale, ``quality'' (QUA=1,2,3)
Predictors: ``segment'' (SEG) and ``stress'' (STR). SEG is
nominal scale with 24 levels, and STR is dychotomous (0,1).
Considering the outcome continuous, two-way ANOVA with
aov(as.integer(QUA) ~ SEG * STR)
doesn't find evidence of interaction between SEG and STR, and they are
significant on their own. This is the result that we would expect from
clinical knowledge.
I use
xtabs(~QUA+SEG, data=da...