Frequencies for first 10,000 rows of prov2065 variable in pos2003 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |        980        9.80       97.69
          1 |        164        1.64       99.33
          2 |         38        0.38       99.71
          3 |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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