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...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...