Frequencies for first 10,000 rows of prov1670 variable in pos1996 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,567       35.67       35.67
          0 |        102        1.02       36.69
          1 |        586        5.86       42.55
          2 |      2,032       20.32       62.87
          3 |      3,713       37.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016