Frequencies for first 10,000 rows of rx11v3c3 variable in nhamcsed2013 dataset : For RX11, | level 3 of | MULTUM drug | category #3 | (detailed | level) | Freq. Percent Cum. ------------+----------------------------------- | 9,999 99.99 99.99 197 | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 7 Nov 2016