Frequencies for first 10,000 rows of proc23d variable in nhamcsed1993 dataset :

      other |
  procedure |
     #2 - 3 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,917       99.17       99.17
        753 |          6        0.06       99.23
        892 |          5        0.05       99.28
        893 |         24        0.24       99.52
        895 |         14        0.14       99.66
        896 |          1        0.01       99.67
        905 |          8        0.08       99.75
        914 |          1        0.01       99.76
        919 |          4        0.04       99.80
        933 |          1        0.01       99.81
        939 |          2        0.02       99.83
        944 |          1        0.01       99.84
        967 |          1        0.01       99.85
        972 |          1        0.01       99.86
        996 |          1        0.01       99.87
        999 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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