Frequencies for first 10,000 rows of drugres1 variable in person dataset : DRUG TEST | RESULTS-1 | Freq. Percent Cum. ------------+----------------------------------- 0 | 7,000 70.00 70.00 1 | 1,109 11.09 81.09 117 | 1 0.01 81.10 128 | 12 0.12 81.22 154 | 1 0.01 81.23 155 | 4 0.04 81.27 165 | 1 0.01 81.28 167 | 2 0.02 81.30 177 | 5 0.05 81.35 187 | 9 0.09 81.44 208 | 5 0.05 81.49 300 | 3 0.03 81.52 303 | 3 0.03 81.55 304 | 5 0.05 81.60 308 | 2 0.02 81.62 313 | 1 0.01 81.63 321 | 9 0.09 81.72 334 | 1 0.01 81.73 343 | 2 0.02 81.75 351 | 3 0.03 81.78 358 | 2 0.02 81.80 401 | 46 0.46 82.26 402 | 23 0.23 82.49 407 | 37 0.37 82.86 410 | 1 0.01 82.87 417 | 39 0.39 83.26 423 | 1 0.01 83.27 522 | 1 0.01 83.28 600 | 6 0.06 83.34 603 | 20 0.20 83.54 606 | 17 0.17 83.71 695 | 4 0.04 83.75 702 | 6 0.06 83.81 996 | 49 0.49 84.30 997 | 214 2.14 86.44 999 | 1,356 13.56 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016