Frequencies for first 10,000 rows of prov2065 variable in pos2004 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |      1,001       10.01       97.67
          1 |        164        1.64       99.31
          2 |         39        0.39       99.70
          3 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016