Frequencies for first 10,000 rows of biopsywi variable in namcs2008 dataset :

biopsy site |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,959       99.59       99.59
       2122 |          1        0.01       99.60
       2723 |          2        0.02       99.62
       3425 |          1        0.01       99.63
       4011 |          1        0.01       99.64
       4414 |          1        0.01       99.65
       4525 |          1        0.01       99.66
       5011 |          1        0.01       99.67
       6712 |          1        0.01       99.68
       6816 |          1        0.01       99.69
       6959 |          1        0.01       99.70
       8511 |          1        0.01       99.71
       8611 |         24        0.24       99.95
       9999 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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