Frequencies for first 10,000 rows of proc52d variable in nhamcsopd1993 dataset :

 service #5 |
  procedure |
   code - 2 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,962       99.62       99.62
         13 |          5        0.05       99.67
         22 |          1        0.01       99.68
         34 |          1        0.01       99.69
         45 |          1        0.01       99.70
         60 |          1        0.01       99.71
         67 |          1        0.01       99.72
         81 |          2        0.02       99.74
         85 |          1        0.01       99.75
         87 |          3        0.03       99.78
         88 |          2        0.02       99.80
         89 |          5        0.05       99.85
         91 |         10        0.10       99.95
         94 |          1        0.01       99.96
         99 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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