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

        Import Date |      Freq.     Percent        Cum.
--------------------+-----------------------------------
2016-05-16 23:14:35 |        552        5.52        5.52
2016-08-23 02:28:31 |      1,736       17.36       22.88
2016-08-24 02:30:21 |      5,918       59.18       82.06
2016-10-19 02:44:25 |      1,794       17.94      100.00
--------------------+-----------------------------------
              Total |     10,000      100.00

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