Frequencies for first 10,000 rows of exmwi12d variable in namcs2004 dataset :

       exam |
write-in #1 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      7,555       75.55       75.55
         09 |          1        0.01       75.56
         37 |          2        0.02       75.58
         38 |          1        0.01       75.59
         64 |          1        0.01       75.60
         86 |          1        0.01       75.61
         89 |      2,086       20.86       96.47
         90 |          1        0.01       96.48
         91 |          1        0.01       96.49
         93 |          1        0.01       96.50
         94 |         82        0.82       97.32
         95 |        255        2.55       99.87
         99 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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