Frequencies for first 10,000 rows of exmwi23d variable in nhamcsopd2004 dataset :

       exam |
write-in #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,561       95.61       95.61
        891 |          4        0.04       95.65
        892 |         65        0.65       96.30
        893 |        241        2.41       98.71
        897 |          1        0.01       98.72
        950 |        127        1.27       99.99
        954 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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