Frequencies for first 10,000 rows of bioprov variable in namcs2013 dataset :

        Biopsy |
      provided |      Freq.     Percent        Cum.
---------------+-----------------------------------
         Blank |         36        0.36        0.36
Not applicable |      9,838       98.38       98.74
           Yes |         97        0.97       99.71
            No |         29        0.29      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017