Frequencies for first 10,000 rows of prov2065 variable in pos2010 dataset :

       SRV: |
    ALCOHOL |
AND/OR DRUG |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,119       11.19       97.45
          1 |        166        1.66       99.11
          2 |         53        0.53       99.64
          3 |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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