polychotomous variable dichotomous variable 'has part' exactly 1 ('categorical measurement datum' and ('has category label' exactly 2 'categorical label')) Orlaith Burke AGB-PRS Alejandra Gonzalez-Beltran Philippe Rocca-Serra a dichotomous variable is a categorical variable which is defined to have only 2 categories or possible values http://udel.edu/~mcdonald/statvartypes.html ready for release