RT Article T1 Validity concerns with multiplying ordinal items defined by binned counts: An application to a quantity-frequency measure of alcohol use JF Methodology A1 McGinley, James S. A2 Curran, Patrick J. 1965- LA English YR 2014 UL https://krimdok.uni-tuebingen.de/Record/1912740389 DO 10.1027/1614-2241/a000081