Frequencies for first 10,000 rows of prov1670 variable in pos1995 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,268       42.68       42.68
          0 |        103        1.03       43.71
          1 |        514        5.14       48.85
          2 |      1,918       19.18       68.03
          3 |      3,197       31.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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