Frequencies for first 10,000 rows of prov2065 variable in pos2008 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |      1,094       10.94       97.49
          1 |        173        1.73       99.22
          2 |         45        0.45       99.67
          3 |         33        0.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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