Frequencies for first 10,000 rows of proc42d variable in nhamcsopd1993 dataset :

 service #4 |
  procedure |
   code - 2 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,857       98.57       98.57
         13 |          8        0.08       98.65
         21 |          1        0.01       98.66
         34 |          1        0.01       98.67
         45 |          2        0.02       98.69
         57 |          2        0.02       98.71
         60 |          1        0.01       98.72
         66 |          1        0.01       98.73
         67 |          2        0.02       98.75
         69 |          5        0.05       98.80
         77 |          1        0.01       98.81
         80 |          3        0.03       98.84
         85 |          2        0.02       98.86
         86 |          1        0.01       98.87
         87 |         13        0.13       99.00
         88 |         20        0.20       99.20
         89 |         17        0.17       99.37
         90 |          7        0.07       99.44
         91 |         35        0.35       99.79
         93 |          7        0.07       99.86
         94 |          4        0.04       99.90
         95 |          3        0.03       99.93
         99 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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