Frequencies for first 10,000 rows of proc52d variable in nhamcsopd1994 dataset :

 service #5 |
  procedure |
   code - 2 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,977       99.77       99.77
         16 |          1        0.01       99.78
         45 |          1        0.01       99.79
         57 |          1        0.01       99.80
         87 |          1        0.01       99.81
         88 |          3        0.03       99.84
         89 |          8        0.08       99.92
         91 |          4        0.04       99.96
         94 |          1        0.01       99.97
         95 |          1        0.01       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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