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

    Alcohol |
Test Result |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,498       14.98       14.98
          1 |         35        0.35       15.33
          2 |         48        0.48       15.81
          3 |         35        0.35       16.16
          4 |         31        0.31       16.47
          5 |         30        0.30       16.77
          6 |         44        0.44       17.21
          7 |         42        0.42       17.63
          8 |         44        0.44       18.07
          9 |         50        0.50       18.57
         10 |         51        0.51       19.08
         11 |         57        0.57       19.65
         12 |         60        0.60       20.25
         13 |         53        0.53       20.78
         14 |         54        0.54       21.32
         15 |         66        0.66       21.98
         16 |         77        0.77       22.75
         17 |         73        0.73       23.48
         18 |         65        0.65       24.13
         19 |         73        0.73       24.86
         20 |         79        0.79       25.65
         21 |         62        0.62       26.27
         22 |         57        0.57       26.84
         23 |         47        0.47       27.31
         24 |         47        0.47       27.78
         25 |         38        0.38       28.16
         26 |         28        0.28       28.44
         27 |         33        0.33       28.77
         28 |         21        0.21       28.98
         29 |         23        0.23       29.21
         30 |         20        0.20       29.41
         31 |         18        0.18       29.59
         32 |         12        0.12       29.71
         33 |          8        0.08       29.79
         34 |          1        0.01       29.80
         35 |          2        0.02       29.82
         36 |          4        0.04       29.86
         37 |          3        0.03       29.89
         38 |          2        0.02       29.91
         40 |          2        0.02       29.93
         41 |          1        0.01       29.94
         42 |          1        0.01       29.95
         43 |          3        0.03       29.98
         44 |          1        0.01       29.99
         48 |          1        0.01       30.00
         49 |          1        0.01       30.01
         50 |          1        0.01       30.02
         52 |          1        0.01       30.03
         56 |          1        0.01       30.04
         95 |          3        0.03       30.07
         96 |      6,102       61.02       91.09
         97 |        406        4.06       95.15
         99 |        485        4.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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