Frequencies for first 10,000 rows of exmwi12d variable in nhamcsopd2001 dataset :

       exam |
write-in #1 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      6,785       67.85       67.85
         83 |          2        0.02       67.87
         89 |      2,385       23.85       91.72
         90 |          1        0.01       91.73
         94 |        231        2.31       94.04
         95 |        575        5.75       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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