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

       Plan |
 Expiration |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,055       50.55       50.55
   1/1/2019 |         38        0.38       50.93
  12/3/2018 |          2        0.02       50.95
 12/31/2017 |          2        0.02       50.97
 12/31/2018 |      4,859       48.59       99.56
 12/31/2050 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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