Frequencies for first 10,000 rows of amb12 variable in nhamcsopd1999 dataset :

 ambulatory |
       surg |
  procedure |
 #1 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,376       93.76       93.76
         03 |         47        0.47       94.23
         04 |          7        0.07       94.30
         05 |          6        0.06       94.36
         06 |          5        0.05       94.41
         08 |          4        0.04       94.45
         09 |          1        0.01       94.46
         12 |          1        0.01       94.47
         13 |          3        0.03       94.50
         14 |          1        0.01       94.51
         18 |          1        0.01       94.52
         20 |          2        0.02       94.54
         21 |          2        0.02       94.56
         26 |          1        0.01       94.57
         28 |          1        0.01       94.58
         31 |          1        0.01       94.59
         33 |          2        0.02       94.61
         34 |          1        0.01       94.62
         36 |          1        0.01       94.63
         37 |         11        0.11       94.74
         38 |          3        0.03       94.77
         39 |          1        0.01       94.78
         40 |          3        0.03       94.81
         41 |          2        0.02       94.83
         42 |          1        0.01       94.84
         44 |         10        0.10       94.94
         45 |        141        1.41       96.35
         47 |          1        0.01       96.36
         48 |          3        0.03       96.39
         49 |          3        0.03       96.42
         50 |          1        0.01       96.43
         51 |          4        0.04       96.47
         53 |          9        0.09       96.56
         54 |          4        0.04       96.60
         56 |          1        0.01       96.61
         57 |         11        0.11       96.72
         58 |          1        0.01       96.73
         65 |          1        0.01       96.74
         66 |          3        0.03       96.77
         67 |          7        0.07       96.84
         68 |          7        0.07       96.91
         69 |         11        0.11       97.02
         70 |          7        0.07       97.09
         71 |          1        0.01       97.10
         75 |          7        0.07       97.17
         77 |          8        0.08       97.25
         79 |          4        0.04       97.29
         80 |         18        0.18       97.47
         81 |         19        0.19       97.66
         82 |          3        0.03       97.69
         83 |          3        0.03       97.72
         84 |          1        0.01       97.73
         85 |         16        0.16       97.89
         86 |        130        1.30       99.19
         87 |          9        0.09       99.28
         89 |          2        0.02       99.30
         90 |          1        0.01       99.31
         93 |          9        0.09       99.40
         94 |          1        0.01       99.41
         96 |         10        0.10       99.51
         97 |         27        0.27       99.78
         98 |          4        0.04       99.82
         99 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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