Frequencies for first 10,000 rows of scpwi12d variable in namcs2005 dataset :

      scope |
  procedure |
     #1 - 2 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,843       98.43       98.43
         18 |          1        0.01       98.44
         21 |          2        0.02       98.46
         22 |          1        0.01       98.47
         31 |          6        0.06       98.53
         44 |          4        0.04       98.57
         45 |        113        1.13       99.70
         48 |          3        0.03       99.73
         49 |          4        0.04       99.77
         54 |          2        0.02       99.79
         57 |          2        0.02       99.81
         70 |          1        0.01       99.82
         80 |          4        0.04       99.86
         99 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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