Frequencies for first 10,000 rows of amb22 variable in nhamcsopd1995 dataset :

 ambulatory |
   surgical |
proc #2 - 2 |
        dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,939       99.39       99.39
         04 |          1        0.01       99.40
         13 |         12        0.12       99.52
         21 |          1        0.01       99.53
         30 |          1        0.01       99.54
         36 |          1        0.01       99.55
         42 |          1        0.01       99.56
         44 |          1        0.01       99.57
         45 |          9        0.09       99.66
         48 |          2        0.02       99.68
         49 |          2        0.02       99.70
         53 |          4        0.04       99.74
         54 |          1        0.01       99.75
         57 |          1        0.01       99.76
         67 |          1        0.01       99.77
         68 |          1        0.01       99.78
         69 |          3        0.03       99.81
         70 |          1        0.01       99.82
         77 |          1        0.01       99.83
         78 |          1        0.01       99.84
         80 |          6        0.06       99.90
         81 |          1        0.01       99.91
         86 |          1        0.01       99.92
         93 |          5        0.05       99.97
         97 |          1        0.01       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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