Frequencies for first 10,000 rows of prov1670 variable in pos1999 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,798       37.98       37.98
          0 |         81        0.81       38.79
          1 |        550        5.50       44.29
          2 |      2,107       21.07       65.36
          3 |      3,464       34.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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