Frequencies for first 10,000 rows of pgm_prtcptn_cd variable in pos1992 dataset :

    program |
participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      4,324       43.24       43.24
          0 |        159        1.59       44.83
          1 |        554        5.54       50.37
          2 |      1,753       17.53       67.90
          3 |      3,210       32.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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