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

       Rate |
 Expiration |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 2015-03-31 |      1,669       16.69       16.69
 2015-06-30 |      1,669       16.69       33.38
 2015-09-30 |      1,669       16.69       50.07
 2015-12-31 |      4,993       49.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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