Frequencies for first 10,000 rows of exciprov variable in namcs2012 dataset :

   Excision of |
        tissue |
      provided |      Freq.     Percent        Cum.
---------------+-----------------------------------
         Blank |        136        1.36        1.36
Not applicable |      9,799       97.99       99.35
           Yes |         55        0.55       99.90
            No |         10        0.10      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016