Frequencies for first 10,000 rows of prov2065 variable in pos2005 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |      1,034       10.34       97.65
          1 |        165        1.65       99.30
          2 |         40        0.40       99.70
          3 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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