Frequencies for first 10,000 rows of exmwi12d variable in namcs2001 dataset :

       exam |
write-in #1 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      7,489       74.89       74.89
         80 |          1        0.01       74.90
         89 |      2,099       20.99       95.89
         90 |          3        0.03       95.92
         93 |          2        0.02       95.94
         94 |         98        0.98       96.92
         95 |        282        2.82       99.74
         99 |         26        0.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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