Frequencies for first 10,000 rows of scpwi13d variable in namcs2005 dataset :

      scope |
  procedure |
     #1 - 3 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,843       98.43       98.43
        181 |          1        0.01       98.44
        212 |          2        0.02       98.46
        221 |          1        0.01       98.47
        314 |          6        0.06       98.53
        441 |          4        0.04       98.57
        451 |         14        0.14       98.71
        452 |         99        0.99       99.70
        482 |          3        0.03       99.73
        492 |          4        0.04       99.77
        542 |          2        0.02       99.79
        573 |          2        0.02       99.81
        702 |          1        0.01       99.82
        802 |          4        0.04       99.86
        999 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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