Frequencies for first 10,000 rows of exmwi22d variable in nhamcsopd2004 dataset :

       exam |
write-in #2 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,561       95.61       95.61
         89 |        311        3.11       98.72
         95 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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