Frequencies for first 10,000 rows of prov1670 variable in pos2002 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,216       42.16       42.16
          0 |         61        0.61       42.77
          1 |        532        5.32       48.09
          2 |      1,488       14.88       62.97
          3 |      3,703       37.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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