Frequencies for first 10,000 rows of planeffectivedate variable in plan2018 dataset :

PlanEffecti |
     veDate |      Freq.     Percent        Cum.
------------+-----------------------------------
   1/1/2017 |          6        0.06        0.06
   1/1/2018 |      9,994       99.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 23 May 2018