Frequencies for first 10,000 rows of amb23 variable in namcs1996 dataset :

 ambulatory |
   surgical |
proc #2 - 3 |
        dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,947       99.47       99.47
        041 |          1        0.01       99.48
        137 |          2        0.02       99.50
        162 |          1        0.01       99.51
        181 |          1        0.01       99.52
        217 |          1        0.01       99.53
        218 |          1        0.01       99.54
        291 |          1        0.01       99.55
        429 |          1        0.01       99.56
        441 |          1        0.01       99.57
        452 |          1        0.01       99.58
        457 |          1        0.01       99.59
        482 |          2        0.02       99.61
        492 |          1        0.01       99.62
        573 |          1        0.01       99.63
        586 |          1        0.01       99.64
        631 |          1        0.01       99.65
        702 |          1        0.01       99.66
        790 |          1        0.01       99.67
        806 |          1        0.01       99.68
        860 |          2        0.02       99.70
        862 |          2        0.02       99.72
        863 |          6        0.06       99.78
        865 |          2        0.02       99.80
        867 |          1        0.01       99.81
        868 |          2        0.02       99.83
        869 |          1        0.01       99.84
        935 |          9        0.09       99.93
        963 |          1        0.01       99.94
        965 |          3        0.03       99.97
        976 |          1        0.01       99.98
        978 |          1        0.01       99.99
        982 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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