Frequencies for first 10,000 rows of exmwi22d variable in nhamcsopd2003 dataset :

       exam |
write-in #2 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,717       97.17       97.17
         89 |        252        2.52       99.69
         94 |          4        0.04       99.73
         95 |         26        0.26       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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