Frequencies for first 10,000 rows of drugres3 variable in person dataset :

  DRUG TEST |
  RESULTS-3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,467       94.67       94.67
        135 |          1        0.01       94.68
        136 |          1        0.01       94.69
        155 |          2        0.02       94.71
        167 |          1        0.01       94.72
        177 |          2        0.02       94.74
        208 |          1        0.01       94.75
        304 |          1        0.01       94.76
        308 |          1        0.01       94.77
        337 |          1        0.01       94.78
        343 |          1        0.01       94.79
        351 |          5        0.05       94.84
        358 |          1        0.01       94.85
        367 |          1        0.01       94.86
        401 |          3        0.03       94.89
        402 |         13        0.13       95.02
        407 |          4        0.04       95.06
        410 |          6        0.06       95.12
        417 |         10        0.10       95.22
        513 |          1        0.01       95.23
        515 |          1        0.01       95.24
        600 |          6        0.06       95.30
        603 |          3        0.03       95.33
        605 |          2        0.02       95.35
        606 |         12        0.12       95.47
        695 |          8        0.08       95.55
        702 |          2        0.02       95.57
        996 |         17        0.17       95.74
        997 |          1        0.01       95.75
        998 |          1        0.01       95.76
        999 |        424        4.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016