Frequencies for first 10,000 rows of exmwi23d variable in nhamcsopd2003 dataset :

       exam |
write-in #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,717       97.17       97.17
        890 |          1        0.01       97.18
        891 |          9        0.09       97.27
        892 |         31        0.31       97.58
        893 |        211        2.11       99.69
        940 |          4        0.04       99.73
        950 |         24        0.24       99.97
        954 |          2        0.02       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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