Frequencies for first 10,000 rows of prov1670 variable in pos1991 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,993       39.93       39.93
          0 |        284        2.84       42.77
          1 |        661        6.61       49.38
          2 |      1,918       19.18       68.56
          3 |      3,144       31.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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