Frequencies for first 10,000 rows of ndctype variable in ndc2lblprodcodexw dataset :

  NDC Type: |
     4-4-2, |
  5-3-2, or |
      5-4-1 |      Freq.     Percent        Cum.
------------+-----------------------------------
      4-4-2 |      9,998       99.98       99.98
      5-4-1 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 May 2018