TY  - JOUR
T1  - Reducing Grouping Distortion in Rank Category Variables
AU  - O'Brien, Robert M.
PY  - 1981
SP  - 605
EP  - 616
JO  - American Journal of Political Science
VL  - 25
IS  - 3
SN  - 0092-5853
UR  - http://www.jstor.org/stable/2110821
ER  -