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

    ALCOHOL |
  TEST TYPE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,526       55.26       55.26
          1 |      3,393       33.93       89.19
          2 |        167        1.67       90.86
          3 |         14        0.14       91.00
          4 |         19        0.19       91.19
          5 |          6        0.06       91.25
          6 |          1        0.01       91.26
          8 |         24        0.24       91.50
          9 |        850        8.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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