Frequencies for first 10,000 rows of prov2065 variable in pos2000 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,871       88.71       88.71
          0 |        895        8.95       97.66
          1 |        168        1.68       99.34
          2 |         43        0.43       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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