Frequencies for first 10,000 rows of explanation_code variable in nadac20160106 dataset :

 Codes that |
 pertain to |
    how the |
  NADAC was |
 calculated |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,337       63.37       63.37
       1, 5 |      1,025       10.25       73.62
    1, 5, 6 |        105        1.05       74.67
       1, 6 |        440        4.40       79.07
          2 |        442        4.42       83.49
       2, 5 |        170        1.70       85.19
    2, 5, 6 |         43        0.43       85.62
       2, 6 |         35        0.35       85.97
          3 |        342        3.42       89.39
       3, 5 |         96        0.96       90.35
    3, 5, 6 |          2        0.02       90.37
       3, 6 |         30        0.30       90.67
          4 |        533        5.33       96.00
       4, 5 |        305        3.05       99.05
    4, 5, 6 |         34        0.34       99.39
       4, 6 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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