Frequencies for first 10,000 rows of exmwi13d variable in nhamcsopd2001 dataset :

       exam |
write-in #1 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      6,785       67.85       67.85
        839 |          2        0.02       67.87
        891 |        388        3.88       71.75
        892 |        439        4.39       76.14
        893 |      1,554       15.54       91.68
        896 |          4        0.04       91.72
        905 |          1        0.01       91.73
        941 |        230        2.30       94.03
        943 |          1        0.01       94.04
        950 |        571        5.71       99.75
        951 |          2        0.02       99.77
        954 |          2        0.02       99.79
        999 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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