Frequencies for first 10,000 rows of planeffectivedate variable in plan2014 dataset :

       Plan |
  Effective |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 0001-01-01 |          2        0.02        0.02
 2014-01-01 |      9,998       99.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Dec 2017