Frequencies for first 10,000 rows of prov2065 variable in pos2009 dataset :

       SRV: |
    ALCOHOL |
AND/OR DRUG |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |      1,109       11.09       97.47
          1 |        168        1.68       99.15
          2 |         50        0.50       99.65
          3 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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