Frequencies for first 10,000 rows of amb2r variable in namcs1997 dataset :

 ambulatory |
   surgical |
  proc #2 - |
    numeric |
     recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,950       99.50       99.50
        820 |          3        0.03       99.53
        881 |          1        0.01       99.54
       1879 |          1        0.01       99.55
       1940 |          1        0.01       99.56
       2132 |          2        0.02       99.58
       2769 |          1        0.01       99.59
       2911 |          1        0.01       99.60
       3142 |          1        0.01       99.61
       4224 |          1        0.01       99.62
       4513 |          2        0.02       99.64
       4523 |          1        0.01       99.65
       5472 |          1        0.01       99.66
       6711 |          1        0.01       99.67
       7021 |          1        0.01       99.68
       8582 |          1        0.01       99.69
       8611 |          4        0.04       99.73
       8628 |          1        0.01       99.74
       8630 |         11        0.11       99.85
       8683 |          1        0.01       99.86
       8689 |          1        0.01       99.87
       8924 |          1        0.01       99.88
       9029 |          2        0.02       99.90
       9039 |          1        0.01       99.91
       9169 |          5        0.05       99.96
       9357 |          2        0.02       99.98
       9625 |          1        0.01       99.99
       9999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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