Frequencies for first 10,000 rows of exmwi12d variable in nhamcsopd2003 dataset :

       exam |
write-in #1 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      8,126       81.26       81.26
         89 |      1,556       15.56       96.82
         93 |         14        0.14       96.96
         94 |         81        0.81       97.77
         95 |        221        2.21       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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