Frequencies for first 10,000 rows of oppro1x variable in h126f dataset :

    2-DIGIT |
   ICD-9-CM |
  PROCEDURE |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
         -1 |      9,403       94.03       94.03
         02 |          1        0.01       94.04
         03 |          8        0.08       94.12
         04 |          3        0.03       94.15
         06 |          1        0.01       94.16
         11 |          2        0.02       94.18
         13 |         10        0.10       94.28
         16 |          4        0.04       94.32
         18 |          4        0.04       94.36
         20 |         11        0.11       94.47
         22 |          4        0.04       94.51
         23 |          3        0.03       94.54
         27 |          2        0.02       94.56
         28 |          8        0.08       94.64
         33 |         26        0.26       94.90
         35 |          1        0.01       94.91
         37 |          5        0.05       94.96
         38 |          1        0.01       94.97
         39 |        117        1.17       96.14
         41 |         57        0.57       96.71
         44 |          1        0.01       96.72
         45 |         17        0.17       96.89
         50 |          3        0.03       96.92
         51 |         16        0.16       97.08
         53 |          7        0.07       97.15
         54 |          1        0.01       97.16
         55 |         15        0.15       97.31
         56 |          1        0.01       97.32
         57 |          4        0.04       97.36
         63 |          2        0.02       97.38
         64 |          4        0.04       97.42
         66 |          2        0.02       97.44
         68 |          7        0.07       97.51
         69 |          5        0.05       97.56
         70 |         11        0.11       97.67
         76 |          1        0.01       97.68
         77 |          4        0.04       97.72
         78 |         11        0.11       97.83
         80 |          7        0.07       97.90
         81 |         80        0.80       98.70
         82 |          1        0.01       98.71
         83 |          7        0.07       98.78
         84 |         54        0.54       99.32
         85 |         10        0.10       99.42
         86 |          8        0.08       99.50
         87 |         10        0.10       99.60
         88 |          1        0.01       99.61
         89 |          5        0.05       99.66
         93 |         28        0.28       99.94
         97 |          2        0.02       99.96
         99 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Feb 2018