Frequencies for first 10,000 rows of pgm_prtcptn_cd variable in pos2008 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,360       43.60       43.60
          1 |        567        5.67       49.27
          2 |        721        7.21       56.48
          3 |      4,352       43.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017