Frequencies for first 10,000 rows of explanation_code variable in nadac20160323 dataset :

 Codes that |
 pertain to |
    how the |
  NADAC was |
 calculated |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,300       63.00       63.00
       1, 5 |        985        9.85       72.85
    1, 5, 6 |         99        0.99       73.84
       1, 6 |        397        3.97       77.81
          2 |        564        5.64       83.45
       2, 5 |        195        1.95       85.40
    2, 5, 6 |         36        0.36       85.76
       2, 6 |         72        0.72       86.48
       3, 5 |          1        0.01       86.49
       3, 6 |          2        0.02       86.51
          4 |        821        8.21       94.72
       4, 5 |        393        3.93       98.65
    4, 5, 6 |         44        0.44       99.09
       4, 6 |         91        0.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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