Frequencies for first 10,000 rows of exmwi22d variable in namcs2004 dataset :

       exam |
write-in #2 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,622       96.22       96.22
         83 |          1        0.01       96.23
         89 |        358        3.58       99.81
         94 |          1        0.01       99.82
         95 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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