Frequencies for first 10,000 rows of proc42d variable in nhamcsopd1994 dataset :

 service #4 |
  procedure |
   code - 2 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,892       98.92       98.92
         41 |          1        0.01       98.93
         45 |          2        0.02       98.95
         54 |          1        0.01       98.96
         67 |          1        0.01       98.97
         69 |          1        0.01       98.98
         70 |          1        0.01       98.99
         75 |          1        0.01       99.00
         86 |          1        0.01       99.01
         87 |         11        0.11       99.12
         88 |         16        0.16       99.28
         89 |         15        0.15       99.43
         91 |         29        0.29       99.72
         93 |          5        0.05       99.77
         94 |          7        0.07       99.84
         95 |          9        0.09       99.93
         99 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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