Frequencies for first 10,000 rows of PGM_PRTCPTN_CD variable in pos2011 dataset :

    Program |
Participati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        173        1.73        1.73
          1 |        517        5.17        6.90
          2 |        733        7.33       14.23
          3 |      3,875       38.75       52.98
          N |      4,702       47.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Apr 2019