Frequencies for first 10,000 rows of prov1670 variable in pos1998 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,780       37.80       37.80
          0 |         91        0.91       38.71
          1 |        551        5.51       44.22
          2 |      2,078       20.78       65.00
          3 |      3,500       35.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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