Frequencies for first 10,000 rows of drugtst1 variable in person dataset :

  DRUG TEST |
     TYPE-1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,463       64.63       64.63
          1 |      1,696       16.96       81.59
          2 |        189        1.89       83.48
          3 |        467        4.67       88.15
          7 |         81        0.81       88.96
          8 |         44        0.44       89.40
          9 |      1,060       10.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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