Frequencies for first 10,000 rows of proc22d variable in nhamcsopd1993 dataset :

 service #2 |
  procedure |
   code - 2 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      8,900       89.00       89.00
         03 |          4        0.04       89.04
         04 |          2        0.02       89.06
         13 |          6        0.06       89.12
         16 |          2        0.02       89.14
         18 |          3        0.03       89.17
         20 |          2        0.02       89.19
         21 |          2        0.02       89.21
         22 |          3        0.03       89.24
         28 |          1        0.01       89.25
         33 |          1        0.01       89.26
         38 |          1        0.01       89.27
         42 |          2        0.02       89.29
         44 |          2        0.02       89.31
         45 |         20        0.20       89.51
         46 |          1        0.01       89.52
         48 |          1        0.01       89.53
         49 |          1        0.01       89.54
         50 |          1        0.01       89.55
         51 |          1        0.01       89.56
         53 |          2        0.02       89.58
         54 |          1        0.01       89.59
         57 |          7        0.07       89.66
         60 |          1        0.01       89.67
         63 |          2        0.02       89.69
         66 |          1        0.01       89.70
         67 |          8        0.08       89.78
         68 |          2        0.02       89.80
         69 |          7        0.07       89.87
         70 |         12        0.12       89.99
         71 |          1        0.01       90.00
         75 |          7        0.07       90.07
         77 |          3        0.03       90.10
         78 |          1        0.01       90.11
         80 |          6        0.06       90.17
         81 |          3        0.03       90.20
         82 |          1        0.01       90.21
         83 |          1        0.01       90.22
         85 |         11        0.11       90.33
         86 |          8        0.08       90.41
         87 |        166        1.66       92.07
         88 |        128        1.28       93.35
         89 |        142        1.42       94.77
         90 |         23        0.23       95.00
         91 |        188        1.88       96.88
         92 |          7        0.07       96.95
         93 |         96        0.96       97.91
         94 |         18        0.18       98.09
         95 |         76        0.76       98.85
         96 |          7        0.07       98.92
         97 |          9        0.09       99.01
         99 |         99        0.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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