Frequencies for first 10,000 rows of prov1670 variable in pos1993 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,598       45.98       45.98
          0 |        139        1.39       47.37
          1 |        504        5.04       52.41
          2 |      1,737       17.37       69.78
          3 |      3,022       30.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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