Frequencies for first 10,000 rows of prov2065 variable in pos2007 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |      1,070       10.70       97.52
          1 |        173        1.73       99.25
          2 |         45        0.45       99.70
          3 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017