Frequencies for first 10,000 rows of proc5 variable in namcs1994 dataset :

 service #5 |
  procedure |
   code - 4 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,981       99.81       99.81
       8744 |          3        0.03       99.84
       8762 |          1        0.01       99.85
       8764 |          1        0.01       99.86
       8871 |          1        0.01       99.87
       8878 |          1        0.01       99.88
       8908 |          1        0.01       99.89
       8926 |          1        0.01       99.90
       8950 |          2        0.02       99.92
       9092 |          1        0.01       99.93
       9099 |          2        0.02       99.95
       9143 |          1        0.01       99.96
       9205 |          1        0.01       99.97
       9532 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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