Frequencies for first 10,000 rows of prov1670 variable in pos1997 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,793       37.93       37.93
          0 |         96        0.96       38.89
          1 |        556        5.56       44.45
          2 |      2,044       20.44       64.89
          3 |      3,511       35.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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