Frequencies for first 10,000 rows of rateexpirationdate variable in rate2018 dataset :

       Rate |
 Expiration |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
 2017-09-30 |         43        0.43        0.43
 2018-03-31 |      2,194       21.94       22.37
 2018-06-30 |      2,194       21.94       44.31
 2018-09-30 |      2,151       21.51       65.82
 2018-12-31 |      3,418       34.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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