Frequencies for first 10,000 rows of prov2065 variable in pos1992 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,851       88.51       88.51
          0 |        854        8.54       97.05
          1 |        212        2.12       99.17
          2 |         53        0.53       99.70
          3 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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