Frequencies for first 10,000 rows of amb22 variable in namcs1996 dataset :

 ambulatory |
   surgical |
proc #2 - 2 |
        dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,947       99.47       99.47
         04 |          1        0.01       99.48
         13 |          2        0.02       99.50
         16 |          1        0.01       99.51
         18 |          1        0.01       99.52
         21 |          2        0.02       99.54
         29 |          1        0.01       99.55
         42 |          1        0.01       99.56
         44 |          1        0.01       99.57
         45 |          2        0.02       99.59
         48 |          2        0.02       99.61
         49 |          1        0.01       99.62
         57 |          1        0.01       99.63
         58 |          1        0.01       99.64
         63 |          1        0.01       99.65
         70 |          1        0.01       99.66
         79 |          1        0.01       99.67
         80 |          1        0.01       99.68
         86 |         16        0.16       99.84
         93 |          9        0.09       99.93
         96 |          4        0.04       99.97
         97 |          2        0.02       99.99
         98 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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