Frequencies for first 10,000 rows of amb23d variable in nhamcsopd2001 dataset :

   surgical |
  procedure |
     #2 - 2 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,924       99.24       99.24
        002 |          5        0.05       99.29
        084 |          1        0.01       99.30
        087 |          1        0.01       99.31
        131 |          1        0.01       99.32
        137 |          2        0.02       99.34
        222 |          1        0.01       99.35
        226 |          2        0.02       99.37
        231 |          1        0.01       99.38
        282 |          1        0.01       99.39
        283 |          1        0.01       99.40
        332 |          2        0.02       99.42
        452 |          1        0.01       99.43
        454 |          2        0.02       99.45
        457 |          2        0.02       99.47
        467 |          1        0.01       99.48
        490 |          1        0.01       99.49
        492 |          1        0.01       99.50
        494 |          2        0.02       99.52
        501 |          1        0.01       99.53
        512 |          1        0.01       99.54
        539 |          1        0.01       99.55
        598 |          1        0.01       99.56
        601 |          1        0.01       99.57
        631 |          1        0.01       99.58
        650 |          1        0.01       99.59
        656 |          2        0.02       99.61
        672 |          1        0.01       99.62
        674 |          1        0.01       99.63
        681 |          2        0.02       99.65
        690 |          2        0.02       99.67
        702 |          1        0.01       99.68
        749 |          1        0.01       99.69
        777 |          1        0.01       99.70
        793 |          1        0.01       99.71
        806 |          3        0.03       99.74
        808 |          1        0.01       99.75
        819 |          1        0.01       99.76
        836 |          1        0.01       99.77
        851 |          3        0.03       99.80
        862 |          3        0.03       99.83
        863 |          1        0.01       99.84
        866 |          3        0.03       99.87
        867 |          1        0.01       99.88
        884 |          1        0.01       99.89
        971 |          1        0.01       99.90
        978 |          3        0.03       99.93
        992 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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