Frequencies for first 10,000 rows of proc12d variable in nhamcsopd1994 dataset :

 service #1 |
  procedure |
   code - 2 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      6,302       63.02       63.02
         01 |          1        0.01       63.03
         03 |         26        0.26       63.29
         04 |          7        0.07       63.36
         05 |          1        0.01       63.37
         06 |          1        0.01       63.38
         08 |          2        0.02       63.40
         12 |          1        0.01       63.41
         13 |          2        0.02       63.43
         14 |          1        0.01       63.44
         16 |          1        0.01       63.45
         18 |          2        0.02       63.47
         21 |          1        0.01       63.48
         26 |          1        0.01       63.49
         31 |          3        0.03       63.52
         33 |          2        0.02       63.54
         38 |          3        0.03       63.57
         39 |          1        0.01       63.58
         40 |          4        0.04       63.62
         41 |          2        0.02       63.64
         42 |          2        0.02       63.66
         44 |         10        0.10       63.76
         45 |         34        0.34       64.10
         46 |          1        0.01       64.11
         48 |          9        0.09       64.20
         50 |          1        0.01       64.21
         51 |          2        0.02       64.23
         53 |          7        0.07       64.30
         54 |          8        0.08       64.38
         55 |          3        0.03       64.41
         57 |         23        0.23       64.64
         58 |          3        0.03       64.67
         60 |          2        0.02       64.69
         62 |          1        0.01       64.70
         63 |          1        0.01       64.71
         64 |          1        0.01       64.72
         66 |          5        0.05       64.77
         67 |         12        0.12       64.89
         68 |         12        0.12       65.01
         69 |         21        0.21       65.22
         70 |         13        0.13       65.35
         71 |          4        0.04       65.39
         74 |          2        0.02       65.41
         75 |        122        1.22       66.63
         77 |          1        0.01       66.64
         78 |          2        0.02       66.66
         79 |          2        0.02       66.68
         80 |          2        0.02       66.70
         81 |          8        0.08       66.78
         83 |          3        0.03       66.81
         85 |         11        0.11       66.92
         86 |        103        1.03       67.95
         87 |        499        4.99       72.94
         88 |        597        5.97       78.91
         89 |        345        3.45       82.36
         90 |         98        0.98       83.34
         91 |        503        5.03       88.37
         92 |         45        0.45       88.82
         93 |        200        2.00       90.82
         94 |        388        3.88       94.70
         95 |        166        1.66       96.36
         96 |         29        0.29       96.65
         97 |         84        0.84       97.49
         98 |          3        0.03       97.52
         99 |        248        2.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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