Frequencies for first 10,000 rows of importdate variable in rate2015 dataset :

        Import Date |      Freq.     Percent        Cum.
--------------------+-----------------------------------
2014-08-07 10:00:19 |        552        5.52        5.52
2014-08-08 08:53:29 |        714        7.14       12.66
2014-09-04 03:25:43 |        288        2.88       15.54
2014-10-02 12:25:15 |        138        1.38       16.92
2015-04-22 11:06:15 |      8,308       83.08      100.00
--------------------+-----------------------------------
              Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017