Frequencies for first 10,000 rows of biopsywir variable in namcs2007 dataset :

     biopsy |
   write-in |
    numeric |
     recode |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,940       99.40       99.40
       1623 |          1        0.01       99.41
       2122 |          1        0.01       99.42
       2723 |          2        0.02       99.44
       4131 |          1        0.01       99.45
       4923 |          1        0.01       99.46
       5011 |          1        0.01       99.47
       5422 |          2        0.02       99.49
       6011 |          1        0.01       99.50
       6712 |          3        0.03       99.53
       6816 |          2        0.02       99.55
       8321 |          2        0.02       99.57
       8511 |          3        0.03       99.60
       8611 |         34        0.34       99.94
       9039 |          1        0.01       99.95
       9999 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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