Frequencies for first 10,000 rows of amb23 variable in namcs1995 dataset :

 ambulatory |
   surgical |
proc #2 - 3 |
        dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,987       99.87       99.87
        429 |          1        0.01       99.88
        491 |          1        0.01       99.89
        681 |          1        0.01       99.90
        702 |          3        0.03       99.93
        935 |          6        0.06       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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