Frequencies for first 10,000 rows of pgm_prtcptn_cd variable in pos2005 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,447       44.47       44.47
          1 |        553        5.53       50.00
          2 |        945        9.45       59.45
          3 |      4,055       40.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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