Frequencies for first 10,000 rows of scpwi12d variable in nhamcsopd2001 dataset :

      scope |
  procedure |
write-in #1 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,911       99.11       99.11
         12 |          2        0.02       99.13
         22 |          1        0.01       99.14
         33 |          2        0.02       99.16
         42 |          3        0.03       99.19
         44 |          3        0.03       99.22
         45 |         52        0.52       99.74
         48 |          4        0.04       99.78
         49 |          1        0.01       99.79
         57 |          6        0.06       99.85
         70 |          9        0.09       99.94
         99 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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