Frequencies for first 10,000 rows of prov2065 variable in pos2006 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |      1,050       10.50       97.60
          1 |        167        1.67       99.27
          2 |         41        0.41       99.68
          3 |         32        0.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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