Frequencies for first 10,000 rows of prov1670 variable in pos2004 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,567       45.67       45.67
          0 |         59        0.59       46.26
          1 |        551        5.51       51.77
          2 |        946        9.46       61.23
          3 |      3,877       38.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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