Frequencies for first 10,000 rows of explanation_code variable in nadac20170614 dataset :

 Codes that |
 pertain to |
    how the |
  NADAC was |
 calculated |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,355       63.55       63.55
       1, 5 |        988        9.88       73.43
    1, 5, 6 |         93        0.93       74.36
       1, 6 |        394        3.94       78.30
          2 |        383        3.83       82.13
       2, 5 |        200        2.00       84.13
    2, 5, 6 |         41        0.41       84.54
       2, 6 |         65        0.65       85.19
          3 |        273        2.73       87.92
       3, 5 |         45        0.45       88.37
    3, 5, 6 |          3        0.03       88.40
       3, 6 |          9        0.09       88.49
          4 |        666        6.66       95.15
       4, 5 |        344        3.44       98.59
    4, 5, 6 |         43        0.43       99.02
       4, 6 |         98        0.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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