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

    ALCOHOL |
  TEST TYPE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,110       61.10       61.10
          1 |      3,336       33.36       94.46
          2 |         72        0.72       95.18
          3 |          7        0.07       95.25
          4 |        127        1.27       96.52
          7 |          2        0.02       96.54
          8 |         11        0.11       96.65
         10 |        107        1.07       97.72
         99 |        228        2.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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