Frequencies for first 10,000 rows of rateeffectivedate variable in rate2015 dataset :

       Rate |
  Effective |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 2015-01-01 |      4,993       49.93       49.93
 2015-04-01 |      1,669       16.69       66.62
 2015-07-01 |      1,669       16.69       83.31
 2015-10-01 |      1,669       16.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017