Frequencies for first 10,000 rows of explanation_code variable in nadac20170823 dataset :

 Codes that |
 pertain to |
    how the |
  NADAC was |
 calculated |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,397       63.97       63.97
       1, 5 |        982        9.82       73.79
    1, 5, 6 |        100        1.00       74.79
       1, 6 |        417        4.17       78.96
          2 |        483        4.83       83.79
       2, 5 |        204        2.04       85.83
    2, 5, 6 |         39        0.39       86.22
       2, 6 |         66        0.66       86.88
          3 |          2        0.02       86.90
       3, 5 |          2        0.02       86.92
          4 |        846        8.46       95.38
       4, 5 |        339        3.39       98.77
    4, 5, 6 |         40        0.40       99.17
       4, 6 |         83        0.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Feb 2018