Frequencies for first 10,000 rows of amb12 variable in nhamcsopd1998 dataset :

 ambulatory |
       surg |
  procedure |
 #1 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,511       95.11       95.11
         03 |         46        0.46       95.57
         04 |          4        0.04       95.61
         05 |          4        0.04       95.65
         06 |          1        0.01       95.66
         08 |          1        0.01       95.67
         21 |          2        0.02       95.69
         23 |          2        0.02       95.71
         24 |          1        0.01       95.72
         27 |          1        0.01       95.73
         38 |          1        0.01       95.74
         39 |          2        0.02       95.76
         40 |          2        0.02       95.78
         41 |          3        0.03       95.81
         42 |          3        0.03       95.84
         43 |          2        0.02       95.86
         45 |        139        1.39       97.25
         47 |          1        0.01       97.26
         48 |          1        0.01       97.27
         49 |          2        0.02       97.29
         53 |          3        0.03       97.32
         54 |          3        0.03       97.35
         57 |         13        0.13       97.48
         59 |          1        0.01       97.49
         60 |          4        0.04       97.53
         67 |          7        0.07       97.60
         68 |          3        0.03       97.63
         69 |          7        0.07       97.70
         70 |          8        0.08       97.78
         71 |          1        0.01       97.79
         75 |         14        0.14       97.93
         79 |          1        0.01       97.94
         80 |          1        0.01       97.95
         81 |         13        0.13       98.08
         85 |          3        0.03       98.11
         86 |        137        1.37       99.48
         89 |          7        0.07       99.55
         93 |          1        0.01       99.56
         95 |          1        0.01       99.57
         96 |          3        0.03       99.60
         97 |         36        0.36       99.96
         98 |          1        0.01       99.97
         99 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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