Frequencies for first 10,000 rows of scpwi13d variable in namcs2001 dataset :

      scope |
  procedure |
write-in #1 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,712       97.12       97.12
        122 |          4        0.04       97.16
        181 |          1        0.01       97.17
        212 |          1        0.01       97.18
        221 |          8        0.08       97.26
        291 |          1        0.01       97.27
        314 |         14        0.14       97.41
        422 |          2        0.02       97.43
        441 |          2        0.02       97.45
        451 |         34        0.34       97.79
        452 |         70        0.70       98.49
        454 |          1        0.01       98.50
        482 |          5        0.05       98.55
        492 |          4        0.04       98.59
        511 |          2        0.02       98.61
        542 |          2        0.02       98.63
        563 |          1        0.01       98.64
        573 |        106        1.06       99.70
        702 |         16        0.16       99.86
        999 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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