Frequencies for first 10,000 rows of rateexpirationdate variable in rate2016 dataset :

       Rate |
 Expiration |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 2015-12-31 |        138        1.38        1.38
 2016-03-31 |      1,690       16.90       18.28
 2016-06-30 |      1,690       16.90       35.18
 2016-09-30 |      1,691       16.91       52.09
 2016-12-31 |      4,791       47.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 6 Oct 2016