Frequencies for first 10,000 rows of exmwi13d variable in nhamcsopd2003 dataset :

       exam |
write-in #1 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      8,126       81.26       81.26
        891 |        112        1.12       82.38
        892 |        339        3.39       85.77
        893 |      1,104       11.04       96.81
        894 |          1        0.01       96.82
        930 |         14        0.14       96.96
        940 |          1        0.01       96.97
        941 |         80        0.80       97.77
        950 |        219        2.19       99.96
        954 |          2        0.02       99.98
        999 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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