Frequencies for first 10,000 rows of importdate variable in plan2018 dataset :

     Import Date |      Freq.     Percent        Cum.
-----------------+-----------------------------------
 1/17/2018 20:16 |        146        1.46        1.46
 1/18/2018 20:16 |        648        6.48        7.94
  1/18/2018 2:20 |        440        4.40       12.34
 1/19/2018 20:16 |        475        4.75       17.09
  1/19/2018 2:20 |      1,962       19.62       36.71
 1/24/2018 20:16 |         51        0.51       37.22
 10/12/2017 2:20 |         72        0.72       37.94
10/16/2017 20:15 |         47        0.47       38.41
10/17/2017 20:15 |        135        1.35       39.76
10/31/2017 20:15 |         71        0.71       40.47
 11/1/2017 20:15 |         42        0.42       40.89
  11/1/2017 2:20 |        762        7.62       48.51
  11/2/2017 2:20 |        217        2.17       50.68
 3/15/2018 11:38 |         58        0.58       51.26
  3/15/2018 2:20 |        129        1.29       52.55
  3/16/2018 2:20 |         20        0.20       52.75
  3/17/2018 5:36 |         29        0.29       53.04
 3/19/2018 20:16 |         96        0.96       54.00
  3/20/2018 2:20 |         63        0.63       54.63
  5/14/2017 2:20 |          5        0.05       54.68
  5/16/2017 2:20 |         12        0.12       54.80
  5/17/2017 2:20 |         16        0.16       54.96
  5/18/2017 2:20 |         10        0.10       55.06
  5/19/2017 2:20 |          4        0.04       55.10
  5/20/2017 2:20 |         10        0.10       55.20
  5/23/2017 2:20 |          2        0.02       55.22
  5/25/2017 2:20 |          1        0.01       55.23
  5/26/2017 2:20 |         16        0.16       55.39
  5/27/2017 2:20 |          8        0.08       55.47
 6/13/2017 20:15 |          4        0.04       55.51
 6/14/2017 20:15 |         12        0.12       55.63
  6/16/2017 2:20 |         11        0.11       55.74
  6/17/2017 2:21 |          8        0.08       55.82
   6/2/2017 2:20 |         19        0.19       56.01
  6/20/2017 2:20 |          8        0.08       56.09
  6/21/2017 2:20 |         11        0.11       56.20
  6/22/2017 2:20 |          6        0.06       56.26
   6/3/2017 2:07 |          9        0.09       56.35
  6/30/2017 2:20 |          8        0.08       56.43
   6/6/2017 2:20 |          1        0.01       56.44
   6/7/2017 2:20 |          5        0.05       56.49
   6/9/2017 2:20 |          8        0.08       56.57
  7/20/2017 2:20 |         14        0.14       56.71
  7/22/2017 3:08 |          1        0.01       56.72
  7/25/2017 2:20 |          2        0.02       56.74
  7/30/2017 2:12 |         66        0.66       57.40
  8/10/2017 2:20 |        141        1.41       58.81
 8/11/2017 20:15 |          6        0.06       58.87
  8/11/2017 2:20 |         57        0.57       59.44
  8/12/2017 2:21 |         22        0.22       59.66
 8/14/2017 20:15 |         91        0.91       60.57
  8/15/2017 2:20 |        179        1.79       62.36
 8/16/2017 20:15 |        505        5.05       67.41
  8/16/2017 2:20 |         26        0.26       67.67
 8/17/2017 20:15 |         62        0.62       68.29
  8/17/2017 2:20 |        902        9.02       77.31
 8/18/2017 20:15 |          6        0.06       77.37
   8/3/2017 2:20 |          3        0.03       77.40
   8/4/2017 2:20 |         23        0.23       77.63
   8/5/2017 2:21 |        111        1.11       78.74
   8/8/2017 2:20 |        258        2.58       81.32
   8/9/2017 2:20 |         42        0.42       81.74
   9/2/2017 2:21 |         56        0.56       82.30
 9/22/2017 20:15 |         95        0.95       83.25
  9/22/2017 2:20 |        177        1.77       85.02
  9/23/2017 2:26 |         93        0.93       85.95
  9/24/2017 2:46 |         19        0.19       86.14
 9/25/2017 20:16 |         26        0.26       86.40
 9/26/2017 20:16 |         72        0.72       87.12
  9/26/2017 2:21 |         68        0.68       87.80
  9/27/2017 3:20 |        212        2.12       89.92
   9/4/2017 2:20 |         26        0.26       90.18
  9/6/2017 20:16 |          8        0.08       90.26
   9/6/2017 2:20 |        474        4.74       95.00
   9/7/2017 7:26 |        500        5.00      100.00
-----------------+-----------------------------------
           Total |     10,000      100.00

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