Frequencies for first 10,000 rows of explanation_code variable in nadac20170913 dataset :

 Codes that |
 pertain to |
    how the |
  NADAC was |
 calculated |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,390       63.90       63.90
       1, 5 |        986        9.86       73.76
    1, 5, 6 |         99        0.99       74.75
       1, 6 |        415        4.15       78.90
          2 |        479        4.79       83.69
       2, 5 |        204        2.04       85.73
    2, 5, 6 |         40        0.40       86.13
       2, 6 |         66        0.66       86.79
          3 |         16        0.16       86.95
       3, 5 |          3        0.03       86.98
    3, 5, 6 |          2        0.02       87.00
       3, 6 |          3        0.03       87.03
          4 |        830        8.30       95.33
       4, 5 |        343        3.43       98.76
    4, 5, 6 |         42        0.42       99.18
       4, 6 |         82        0.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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