Frequencies for first 10,000 rows of scpwi13d variable in nhamcsopd2005 dataset :

      scope |
  procedure |
     #1 - 3 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,821       98.21       98.21
        181 |          1        0.01       98.22
        221 |          1        0.01       98.23
        314 |          3        0.03       98.26
        332 |          2        0.02       98.28
        451 |         19        0.19       98.47
        452 |         82        0.82       99.29
        542 |          8        0.08       99.37
        552 |          1        0.01       99.38
        563 |          2        0.02       99.40
        573 |         17        0.17       99.57
        681 |          3        0.03       99.60
        702 |         32        0.32       99.92
        802 |          3        0.03       99.95
        999 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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