Frequencies for first 10,000 rows of planexpirationdate variable in plan2017 dataset :

       Plan |
 Expiration |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,506       55.06       55.06
 2017-12-31 |      4,360       43.60       98.66
 2018-01-01 |        134        1.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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