Frequencies for first 10,000 rows of importdate variable in plan2015 dataset :

        Import Date |      Freq.     Percent        Cum.
--------------------+-----------------------------------
2014-06-21 03:20:41 |         20        0.20        0.20
2014-06-27 08:32:44 |          6        0.06        0.26
2014-08-03 08:59:32 |         46        0.46        0.72
2014-08-05 13:28:44 |         47        0.47        1.19
2014-08-06 08:27:55 |          9        0.09        1.28
2014-08-07 10:00:19 |        104        1.04        2.32
2014-08-08 08:53:29 |        108        1.08        3.40
2014-08-23 04:11:13 |         17        0.17        3.57
2014-08-27 03:27:11 |         36        0.36        3.93
2014-08-28 04:23:13 |         54        0.54        4.47
2014-08-29 03:26:18 |         14        0.14        4.61
2014-08-31 07:07:13 |         16        0.16        4.77
2014-09-03 04:28:59 |        158        1.58        6.35
2014-09-04 03:25:43 |        387        3.87       10.22
2014-09-05 03:32:16 |        107        1.07       11.29
2014-09-06 03:39:47 |        332        3.32       14.61
2014-09-29 21:43:29 |        155        1.55       16.16
2014-10-02 12:25:15 |        130        1.30       17.46
2014-10-03 13:54:42 |         70        0.70       18.16
2014-10-05 17:13:14 |        149        1.49       19.65
2014-11-09 04:38:15 |        661        6.61       26.26
2014-11-11 04:41:18 |        330        3.30       29.56
2014-11-12 05:24:58 |        268        2.68       32.24
2014-11-13 10:25:37 |        128        1.28       33.52
2014-11-14 05:23:27 |        278        2.78       36.30
2014-11-15 04:52:41 |        410        4.10       40.40
2014-12-06 05:18:25 |        189        1.89       42.29
2014-12-10 11:54:40 |        245        2.45       44.74
2014-12-11 04:09:12 |        336        3.36       48.10
2014-12-12 09:23:47 |         68        0.68       48.78
2015-01-16 17:32:32 |      1,121       11.21       59.99
2015-01-17 03:15:53 |        255        2.55       62.54
2015-01-20 13:44:26 |         37        0.37       62.91
2015-01-21 09:35:36 |        344        3.44       66.35
2015-01-22 10:35:59 |        107        1.07       67.42
2015-01-23 09:32:01 |         15        0.15       67.57
2015-02-13 08:19:48 |        682        6.82       74.39
2015-02-18 06:26:47 |        157        1.57       75.96
2015-02-19 06:21:02 |      1,069       10.69       86.65
2015-02-20 06:27:36 |          8        0.08       86.73
2015-04-22 11:06:15 |        552        5.52       92.25
2015-05-20 14:11:45 |         94        0.94       93.19
2015-06-19 13:25:37 |        261        2.61       95.80
2015-07-22 09:15:52 |        420        4.20      100.00
--------------------+-----------------------------------
              Total |     10,000      100.00

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