Frequencies for first 10,000 rows of effectivedate variable in nadacc dataset :

  Effective |
Date of the |
  NADAC Per |
  Unit Cost |      Freq.     Percent        Cum.
------------+-----------------------------------
  01jun2017 |        137        1.37        1.37
  08jun2017 |         54        0.54        1.91
  21jun2017 |        130        1.30        3.21
  28jun2017 |          1        0.01        3.22
  01jul2017 |          8        0.08        3.30
  05jul2017 |          2        0.02        3.32
  12jul2017 |          2        0.02        3.34
  19jul2017 |        175        1.75        5.09
  20jul2017 |          2        0.02        5.11
  27jul2017 |          1        0.01        5.12
  23aug2017 |        106        1.06        6.18
  06sep2017 |          1        0.01        6.19
  13sep2017 |          2        0.02        6.21
  20sep2017 |        125        1.25        7.46
  28sep2017 |          2        0.02        7.48
  29sep2017 |          1        0.01        7.49
  18oct2017 |        108        1.08        8.57
  25oct2017 |          1        0.01        8.58
  01nov2017 |          2        0.02        8.60
  15nov2017 |          2        0.02        8.62
  22nov2017 |        168        1.68       10.30
  29nov2017 |          1        0.01       10.31
  06dec2017 |          1        0.01       10.32
  15dec2017 |          6        0.06       10.38
  20dec2017 |        117        1.17       11.55
  21dec2017 |          1        0.01       11.56
  22dec2017 |          9        0.09       11.65
  29dec2017 |          3        0.03       11.68
  01jan2018 |        229        2.29       13.97
  04jan2018 |          7        0.07       14.04
  05jan2018 |         43        0.43       14.47
  10jan2018 |          1        0.01       14.48
  17jan2018 |        110        1.10       15.58
  07feb2018 |          1        0.01       15.59
  14feb2018 |          2        0.02       15.61
  21feb2018 |        105        1.05       16.66
          . |      8,334       83.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 1 Mar 2018