Frequencies for first 10,000 rows of explanation_code variable in nadac20170802 dataset :

 Codes that |
 pertain to |
    how the |
  NADAC was |
 calculated |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,502       65.02       65.02
       1, 5 |        978        9.78       74.80
    1, 5, 6 |         96        0.96       75.76
       1, 6 |        412        4.12       79.88
          2 |        360        3.60       83.48
       2, 5 |        191        1.91       85.39
    2, 5, 6 |         42        0.42       85.81
       2, 6 |         68        0.68       86.49
          3 |         82        0.82       87.31
       3, 5 |         20        0.20       87.51
          4 |        748        7.48       94.99
       4, 5 |        373        3.73       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