Frequencies for first 10,000 rows of amb12 variable in namcs1997 dataset :

 ambulatory |
       surg |
  procedure |
 #1 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,442       94.42       94.42
         03 |          1        0.01       94.43
         04 |          1        0.01       94.44
         06 |          3        0.03       94.47
         08 |         13        0.13       94.60
         09 |          4        0.04       94.64
         11 |          2        0.02       94.66
         12 |          5        0.05       94.71
         13 |          3        0.03       94.74
         14 |         10        0.10       94.84
         16 |          3        0.03       94.87
         18 |          7        0.07       94.94
         19 |          1        0.01       94.95
         20 |          4        0.04       94.99
         21 |         14        0.14       95.13
         22 |          3        0.03       95.16
         27 |          4        0.04       95.20
         29 |          2        0.02       95.22
         31 |          4        0.04       95.26
         37 |          1        0.01       95.27
         38 |          1        0.01       95.28
         39 |          8        0.08       95.36
         40 |          1        0.01       95.37
         45 |         44        0.44       95.81
         46 |          1        0.01       95.82
         48 |          3        0.03       95.85
         49 |         11        0.11       95.96
         53 |          1        0.01       95.97
         54 |          2        0.02       95.99
         57 |         21        0.21       96.20
         58 |          3        0.03       96.23
         59 |          1        0.01       96.24
         60 |         12        0.12       96.36
         63 |         10        0.10       96.46
         64 |          1        0.01       96.47
         65 |          1        0.01       96.48
         67 |          4        0.04       96.52
         68 |          9        0.09       96.61
         69 |          5        0.05       96.66
         70 |          3        0.03       96.69
         71 |          3        0.03       96.72
         76 |          1        0.01       96.73
         79 |          2        0.02       96.75
         81 |         15        0.15       96.90
         82 |          1        0.01       96.91
         83 |          2        0.02       96.93
         85 |          7        0.07       97.00
         86 |        262        2.62       99.62
         91 |          1        0.01       99.63
         92 |          1        0.01       99.64
         96 |         12        0.12       99.76
         97 |         17        0.17       99.93
         99 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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