Frequencies for first 10,000 rows of amb12 variable in nhamcsopd1997 dataset :

 ambulatory |
       surg |
  procedure |
 #1 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,575       95.75       95.75
         03 |         39        0.39       96.14
         04 |          3        0.03       96.17
         05 |          6        0.06       96.23
         06 |          1        0.01       96.24
         08 |          3        0.03       96.27
         13 |          4        0.04       96.31
         14 |          2        0.02       96.33
         16 |          1        0.01       96.34
         18 |          3        0.03       96.37
         20 |          2        0.02       96.39
         21 |          2        0.02       96.41
         23 |          1        0.01       96.42
         28 |          3        0.03       96.45
         31 |          3        0.03       96.48
         34 |          3        0.03       96.51
         37 |          1        0.01       96.52
         38 |          2        0.02       96.54
         41 |          2        0.02       96.56
         44 |          4        0.04       96.60
         45 |         47        0.47       97.07
         47 |          2        0.02       97.09
         48 |          3        0.03       97.12
         49 |          1        0.01       97.13
         50 |          2        0.02       97.15
         51 |          2        0.02       97.17
         53 |          5        0.05       97.22
         54 |          3        0.03       97.25
         57 |          8        0.08       97.33
         60 |          1        0.01       97.34
         63 |          2        0.02       97.36
         64 |          3        0.03       97.39
         66 |          3        0.03       97.42
         67 |         11        0.11       97.53
         68 |          8        0.08       97.61
         69 |         12        0.12       97.73
         70 |         11        0.11       97.84
         71 |          1        0.01       97.85
         73 |          1        0.01       97.86
         75 |         19        0.19       98.05
         78 |          1        0.01       98.06
         79 |          5        0.05       98.11
         80 |          9        0.09       98.20
         81 |          9        0.09       98.29
         82 |          1        0.01       98.30
         83 |          3        0.03       98.33
         85 |          5        0.05       98.38
         86 |         67        0.67       99.05
         88 |          1        0.01       99.06
         89 |          1        0.01       99.07
         91 |          2        0.02       99.09
         93 |         19        0.19       99.28
         94 |          2        0.02       99.30
         96 |          5        0.05       99.35
         97 |         43        0.43       99.78
         98 |          2        0.02       99.80
         99 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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