Frequencies for first 10,000 rows of prov1670 variable in pos2006 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,357       43.57       43.57
          1 |        548        5.48       49.05
          2 |        947        9.47       58.52
          3 |      4,148       41.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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