Frequencies for first 10,000 rows of amb12 variable in nhamcsopd2000 dataset :

 ambulatory |
       surg |
  procedure |
 #1 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,507       95.07       95.07
         02 |          1        0.01       95.08
         03 |         18        0.18       95.26
         04 |          2        0.02       95.28
         11 |          1        0.01       95.29
         13 |          5        0.05       95.34
         14 |          1        0.01       95.35
         16 |          1        0.01       95.36
         18 |          2        0.02       95.38
         19 |          1        0.01       95.39
         20 |          2        0.02       95.41
         21 |          3        0.03       95.44
         38 |          6        0.06       95.50
         39 |          1        0.01       95.51
         40 |          1        0.01       95.52
         41 |          1        0.01       95.53
         42 |          4        0.04       95.57
         43 |          1        0.01       95.58
         44 |          1        0.01       95.59
         45 |         62        0.62       96.21
         46 |          3        0.03       96.24
         48 |          1        0.01       96.25
         49 |          3        0.03       96.28
         50 |          2        0.02       96.30
         51 |          5        0.05       96.35
         53 |          2        0.02       96.37
         54 |          2        0.02       96.39
         57 |          6        0.06       96.45
         62 |          2        0.02       96.47
         63 |          4        0.04       96.51
         64 |          3        0.03       96.54
         67 |          8        0.08       96.62
         68 |         13        0.13       96.75
         69 |          4        0.04       96.79
         70 |          4        0.04       96.83
         72 |          1        0.01       96.84
         73 |          2        0.02       96.86
         74 |          1        0.01       96.87
         75 |         10        0.10       96.97
         79 |          2        0.02       96.99
         80 |          5        0.05       97.04
         81 |          7        0.07       97.11
         83 |          1        0.01       97.12
         85 |         13        0.13       97.25
         86 |        148        1.48       98.73
         87 |          2        0.02       98.75
         89 |          5        0.05       98.80
         91 |          1        0.01       98.81
         93 |         15        0.15       98.96
         94 |          1        0.01       98.97
         95 |          2        0.02       98.99
         96 |         15        0.15       99.14
         97 |         38        0.38       99.52
         98 |          5        0.05       99.57
         99 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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