Frequencies for first 10,000 rows of drugres2 variable in person dataset :

  DRUG TEST |
  RESULTS-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,750       97.50       97.50
          1 |         82        0.82       98.32
        128 |          4        0.04       98.36
        167 |          1        0.01       98.37
        177 |          6        0.06       98.43
        187 |          2        0.02       98.45
        208 |          2        0.02       98.47
        300 |          1        0.01       98.48
        304 |          2        0.02       98.50
        308 |          1        0.01       98.51
        313 |          1        0.01       98.52
        321 |          3        0.03       98.55
        334 |          1        0.01       98.56
        348 |          1        0.01       98.57
        351 |          8        0.08       98.65
        376 |          1        0.01       98.66
        401 |          6        0.06       98.72
        402 |          6        0.06       98.78
        407 |         19        0.19       98.97
        410 |          5        0.05       99.02
        417 |         33        0.33       99.35
        600 |          3        0.03       99.38
        603 |          8        0.08       99.46
        605 |          1        0.01       99.47
        606 |         11        0.11       99.58
        695 |          5        0.05       99.63
        702 |          1        0.01       99.64
        795 |          1        0.01       99.65
        996 |         33        0.33       99.98
        998 |          1        0.01       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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