Frequencies for first 10,000 rows of rateexpirationdate variable in rate2017 dataset :

       Rate |
 Expiration |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 2017-03-31 |      2,074       20.74       20.74
 2017-06-30 |      2,074       20.74       41.48
 2017-09-30 |      2,075       20.75       62.23
 2017-12-31 |      3,777       37.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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