Frequencies for first 10,000 rows of planeffictivedate variable in plan2016 dataset :

       Plan |
  Effective |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 2013-01-01 |          1        0.01        0.01
 2016-01-01 |      9,999       99.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 6 Oct 2016