Frequencies for first 10,000 rows of exmwi22d variable in nhamcsopd2002 dataset :

       exam |
write-in #2 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,613       96.13       96.13
         75 |          1        0.01       96.14
         89 |        339        3.39       99.53
         94 |          1        0.01       99.54
         95 |         45        0.45       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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