Frequencies for planid variable in mmp2015 dataset :

    Plan ID |      Freq.     Percent        Cum.
------------+-----------------------------------
        001 |        450       98.68       98.68
        002 |          4        0.88       99.56
        005 |          1        0.22       99.78
        006 |          1        0.22      100.00
------------+-----------------------------------
      Total |        456      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016