Frequencies for first 10,000 rows of tc3 variable in h68f4 dataset : MULTUM | THERAPEUTIC | CLASS #3 | Freq. Percent Cum. ------------+----------------------------------- -1 | 9,966 99.66 99.66 133 | 2 0.02 99.68 242 | 32 0.32 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Feb 2018