Frequencies for first 10,000 rows of exmwi23d variable in nhamcsopd2001 dataset :

       exam |
write-in #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,124       91.24       91.24
        891 |         86        0.86       92.10
        892 |        261        2.61       94.71
        893 |        316        3.16       97.87
        896 |          1        0.01       97.88
        914 |          1        0.01       97.89
        940 |          2        0.02       97.91
        941 |         43        0.43       98.34
        950 |        157        1.57       99.91
        951 |          7        0.07       99.98
        954 |          1        0.01       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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