Frequencies for first 10,000 rows of proc5 variable in namcs1993 dataset :

 service #5 |
  procedure |
   code - 4 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,987       99.87       99.87
       0392 |          2        0.02       99.89
       496- |          1        0.01       99.90
       8737 |          1        0.01       99.91
       8764 |          1        0.01       99.92
       8874 |          1        0.01       99.93
       8934 |          1        0.01       99.94
       8944 |          1        0.01       99.95
       897- |          1        0.01       99.96
       9335 |          1        0.01       99.97
       9427 |          1        0.01       99.98
       9999 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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