Frequencies for first 10,000 rows of explanation_code variable in nadac20170816 dataset :

 Codes that |
 pertain to |
    how the |
  NADAC was |
 calculated |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,476       64.76       64.76
       1, 5 |        976        9.76       74.52
    1, 5, 6 |         99        0.99       75.51
       1, 6 |        412        4.12       79.63
          2 |        358        3.58       83.21
       2, 5 |        190        1.90       85.11
    2, 5, 6 |         42        0.42       85.53
       2, 6 |         68        0.68       86.21
          3 |        107        1.07       87.28
       3, 5 |         23        0.23       87.51
          4 |        749        7.49       95.00
       4, 5 |        372        3.72       98.72
    4, 5, 6 |         39        0.39       99.11
       4, 6 |         89        0.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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