Frequencies for first 10,000 rows of amb23 variable in nhamcsopd1995 dataset :

 ambulatory |
   surgical |
proc #2 - 3 |
        dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,939       99.39       99.39
        047 |          1        0.01       99.40
        137 |         12        0.12       99.52
        216 |          1        0.01       99.53
        300 |          1        0.01       99.54
        360 |          1        0.01       99.55
        429 |          1        0.01       99.56
        441 |          1        0.01       99.57
        452 |          5        0.05       99.62
        454 |          3        0.03       99.65
        459 |          1        0.01       99.66
        482 |          1        0.01       99.67
        483 |          1        0.01       99.68
        492 |          1        0.01       99.69
        494 |          1        0.01       99.70
        530 |          4        0.04       99.74
        542 |          1        0.01       99.75
        573 |          1        0.01       99.76
        671 |          1        0.01       99.77
        681 |          1        0.01       99.78
        690 |          3        0.03       99.81
        702 |          1        0.01       99.82
        775 |          1        0.01       99.83
        786 |          1        0.01       99.84
        801 |          1        0.01       99.85
        802 |          1        0.01       99.86
        806 |          1        0.01       99.87
        808 |          3        0.03       99.90
        819 |          1        0.01       99.91
        865 |          1        0.01       99.92
        935 |          5        0.05       99.97
        978 |          1        0.01       99.98
        990 |          1        0.01       99.99
        992 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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