Frequencies for ndc variable in nadacc20170705 dataset :

   National |
  Drug Code |
      (NDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
00131326532 |          1        3.45        3.45
00131326546 |          1        3.45        6.90
00378398193 |          1        3.45       10.34
00591369519 |          1        3.45       13.79
00591369530 |          1        3.45       17.24
10147095401 |          1        3.45       20.69
10147095403 |          1        3.45       24.14
13811071230 |          1        3.45       27.59
13811071290 |          1        3.45       31.03
17772010101 |          1        3.45       34.48
17772010115 |          1        3.45       37.93
17772010201 |          1        3.45       41.38
17772010215 |          1        3.45       44.83
17772010301 |          1        3.45       48.28
17772010315 |          1        3.45       51.72
17772010401 |          1        3.45       55.17
17772010415 |          1        3.45       58.62
17772012101 |          1        3.45       62.07
17772012201 |          1        3.45       65.52
17772012301 |          1        3.45       68.97
41616076081 |          1        3.45       72.41
41616076083 |          1        3.45       75.86
42211010111 |          1        3.45       79.31
50474059540 |          1        3.45       82.76
62175031137 |          1        3.45       86.21
65580030103 |          1        3.45       89.66
65580030109 |          1        3.45       93.10
68025007930 |          1        3.45       96.55
68025007990 |          1        3.45      100.00
------------+-----------------------------------
      Total |         29      100.00

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