10.5 Use the logist1 data from www.psych.yorku.ca/lab/psy6140/ex/logistic.htm to fit the proportional odds model predicting the level of improvement from sex and treatment.

Assume that the level of improvement is ordinal, with categories representing 0 = no improvement, 1 = some improvement, 2 = marked improvement. Describe your model selection process and fully interpret the results of the final model selected.