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

    ALCOHOL |
  TEST TYPE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,856       58.56       58.56
          1 |      3,708       37.08       95.64
          2 |        103        1.03       96.67
          3 |         10        0.10       96.77
          4 |         30        0.30       97.07
          5 |         13        0.13       97.20
          7 |          5        0.05       97.25
          8 |          5        0.05       97.30
         10 |        137        1.37       98.67
         99 |        133        1.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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