Frequencies for first 10,000 rows of amb12 variable in namcs1999 dataset :

 ambulatory |
       surg |
  procedure |
 #1 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,380       93.80       93.80
         03 |          3        0.03       93.83
         06 |          1        0.01       93.84
         08 |          6        0.06       93.90
         13 |          4        0.04       93.94
         14 |          6        0.06       94.00
         18 |          7        0.07       94.07
         19 |          1        0.01       94.08
         20 |          4        0.04       94.12
         21 |         13        0.13       94.25
         24 |          1        0.01       94.26
         27 |          2        0.02       94.28
         28 |          3        0.03       94.31
         29 |          1        0.01       94.32
         31 |          3        0.03       94.35
         38 |          1        0.01       94.36
         39 |          3        0.03       94.39
         41 |          1        0.01       94.40
         44 |          1        0.01       94.41
         45 |         17        0.17       94.58
         49 |         12        0.12       94.70
         51 |          1        0.01       94.71
         54 |          3        0.03       94.74
         55 |          1        0.01       94.75
         57 |          4        0.04       94.79
         58 |          4        0.04       94.83
         61 |          3        0.03       94.86
         63 |          7        0.07       94.93
         64 |          4        0.04       94.97
         67 |          2        0.02       94.99
         68 |          3        0.03       95.02
         69 |          1        0.01       95.03
         70 |          2        0.02       95.05
         71 |          1        0.01       95.06
         80 |          1        0.01       95.07
         81 |         12        0.12       95.19
         83 |          2        0.02       95.21
         85 |          7        0.07       95.28
         86 |        388        3.88       99.16
         89 |          3        0.03       99.19
         91 |          2        0.02       99.21
         93 |         11        0.11       99.32
         95 |          5        0.05       99.37
         96 |         28        0.28       99.65
         97 |         26        0.26       99.91
         98 |          4        0.04       99.95
         99 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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