Frequencies for first 10,000 rows of exmwi12d variable in nhamcsopd2004 dataset :

       exam |
write-in #1 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      7,650       76.50       76.50
         75 |         25        0.25       76.75
         89 |      2,128       21.28       98.03
         94 |         23        0.23       98.26
         95 |        132        1.32       99.58
         99 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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