Frequencies for first 10,000 rows of exmwi23d variable in nhamcsopd2002 dataset :

       exam |
write-in #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,613       96.13       96.13
        753 |          1        0.01       96.14
        891 |          7        0.07       96.21
        892 |        132        1.32       97.53
        893 |        199        1.99       99.52
        895 |          1        0.01       99.53
        940 |          1        0.01       99.54
        950 |         42        0.42       99.96
        954 |          3        0.03       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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