Frequencies for first 10,000 rows of scpwi12d variable in nhamcsopd2003 dataset :

      scope |
  procedure |
write-in #1 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,809       98.09       98.09
         18 |          1        0.01       98.10
         29 |          1        0.01       98.11
         31 |          1        0.01       98.12
         33 |          2        0.02       98.14
         34 |          2        0.02       98.16
         44 |          2        0.02       98.18
         45 |         98        0.98       99.16
         48 |          3        0.03       99.19
         49 |          1        0.01       99.20
         54 |         14        0.14       99.34
         57 |         19        0.19       99.53
         68 |         12        0.12       99.65
         70 |         25        0.25       99.90
         80 |          6        0.06       99.96
         99 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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