Frequencies for first 10,000 rows of drugres3 variable in person dataset : DRUG TEST | RESULTS-3 | Freq. Percent Cum. ------------+----------------------------------- 0 | 9,918 99.18 99.18 1 | 1 0.01 99.19 154 | 1 0.01 99.20 155 | 1 0.01 99.21 177 | 2 0.02 99.23 188 | 1 0.01 99.24 208 | 2 0.02 99.26 304 | 1 0.01 99.27 313 | 1 0.01 99.28 321 | 2 0.02 99.30 343 | 1 0.01 99.31 348 | 1 0.01 99.32 351 | 3 0.03 99.35 367 | 1 0.01 99.36 401 | 6 0.06 99.42 407 | 9 0.09 99.51 410 | 12 0.12 99.63 417 | 7 0.07 99.70 422 | 1 0.01 99.71 423 | 1 0.01 99.72 600 | 1 0.01 99.73 606 | 2 0.02 99.75 695 | 3 0.03 99.78 996 | 21 0.21 99.99 999 | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016