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

        Import Date |      Freq.     Percent        Cum.
--------------------+-----------------------------------
2017-09-02 02:21:27 |      7,380       73.80       73.80
2017-09-26 02:21:16 |      1,855       18.55       92.35
2017-11-01 02:20:20 |        765        7.65      100.00
--------------------+-----------------------------------
              Total |     10,000      100.00

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