Frequencies for first 10,000 rows of exmwi23d variable in namcs2002 dataset :

       Exam |
write-in #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,647       96.47       96.47
        891 |         12        0.12       96.59
        892 |         90        0.90       97.49
        893 |        230        2.30       99.79
        896 |          1        0.01       99.80
        897 |          4        0.04       99.84
        930 |          9        0.09       99.93
        940 |          2        0.02       99.95
        941 |          2        0.02       99.97
        950 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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