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

  Drug Test |
  -Type (1) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,161       61.61       61.61
          1 |      3,023       30.23       91.84
          2 |         67        0.67       92.51
          3 |         20        0.20       92.71
          6 |        667        6.67       99.38
          7 |         11        0.11       99.49
          8 |         24        0.24       99.73
          9 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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