Frequencies for first 10,000 rows of drug4cl2 variable in namcs2004 dataset : ndc code #2 | for | medication | #4 | Freq. Percent Cum. ------------+----------------------------------- | 9,851 98.51 98.51 0120 | 1 0.01 98.52 0503 | 1 0.01 98.53 0507 | 16 0.16 98.69 0510 | 3 0.03 98.72 0512 | 10 0.10 98.82 0513 | 7 0.07 98.89 0630 | 2 0.02 98.91 0878 | 1 0.01 98.92 0913 | 2 0.02 98.94 0916 | 2 0.02 98.96 1040 | 2 0.02 98.98 1180 | 1 0.01 98.99 1265 | 3 0.03 99.02 1275 | 1 0.01 99.03 1373 | 3 0.03 99.06 1569 | 1 0.01 99.07 1671 | 3 0.03 99.10 1724 | 55 0.55 99.65 1727 | 17 0.17 99.82 1728 | 6 0.06 99.88 1941 | 1 0.01 99.89 1943 | 4 0.04 99.93 1944 | 1 0.01 99.94 1947 | 3 0.03 99.97 2095 | 2 0.02 99.99 2100 | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016