Frequencies for first 10,000 rows of proc53d variable in namcs1994 dataset :

 service #5 |
  procedure |
   code - 3 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,981       99.81       99.81
        874 |          3        0.03       99.84
        876 |          2        0.02       99.86
        887 |          2        0.02       99.88
        890 |          1        0.01       99.89
        892 |          1        0.01       99.90
        895 |          2        0.02       99.92
        909 |          3        0.03       99.95
        914 |          1        0.01       99.96
        920 |          1        0.01       99.97
        953 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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