Frequencies for first 10,000 rows of amb2r variable in namcs2000 dataset :

 ambulatory |
   surgical |
  proc #2 - |
    numeric |
     recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,979       99.79       99.79
        820 |          1        0.01       99.80
       1829 |          1        0.01       99.81
       6909 |          1        0.01       99.82
       7904 |          1        0.01       99.83
       8100 |          1        0.01       99.84
       8192 |          1        0.01       99.85
       8519 |          4        0.04       99.89
       8520 |          1        0.01       99.90
       8609 |          1        0.01       99.91
       8630 |          1        0.01       99.92
       8922 |          1        0.01       99.93
       9162 |          1        0.01       99.94
       9357 |          2        0.02       99.96
       9659 |          1        0.01       99.97
       9787 |          1        0.01       99.98
       9820 |          1        0.01       99.99
       9828 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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