Frequencies for first 10,000 rows of exmwi12d variable in nhamcsopd2002 dataset :

       exam |
write-in #1 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      6,983       69.83       69.83
         75 |         23        0.23       70.06
         89 |      2,354       23.54       93.60
         94 |         64        0.64       94.24
         95 |        443        4.43       98.67
         99 |        133        1.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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