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

  DRUG TEST |
  RESULTS-3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,496       94.96       94.96
        128 |          3        0.03       94.99
        186 |          1        0.01       95.00
        187 |          1        0.01       95.01
        208 |          1        0.01       95.02
        300 |          1        0.01       95.03
        308 |          1        0.01       95.04
        334 |          1        0.01       95.05
        343 |          2        0.02       95.07
        348 |          1        0.01       95.08
        351 |          4        0.04       95.12
        352 |          1        0.01       95.13
        358 |          1        0.01       95.14
        401 |          2        0.02       95.16
        402 |          1        0.01       95.17
        407 |         10        0.10       95.27
        410 |         14        0.14       95.41
        417 |          4        0.04       95.45
        423 |          1        0.01       95.46
        515 |          1        0.01       95.47
        603 |          4        0.04       95.51
        605 |          1        0.01       95.52
        606 |          8        0.08       95.60
        695 |         14        0.14       95.74
        702 |          4        0.04       95.78
        704 |          1        0.01       95.79
        996 |         32        0.32       96.11
        997 |         65        0.65       96.76
        999 |        324        3.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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