Frequencies for first 10,000 rows of examwi1 variable in nhamcsopd2003 dataset :

       exam |
write-in #1 |
  - 4 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      8,126       81.26       81.26
       8913 |        111        1.11       82.37
       8915 |          1        0.01       82.38
       8926 |        339        3.39       85.77
       8931 |         14        0.14       85.91
       8934 |         44        0.44       86.35
       8936 |        182        1.82       88.17
       8937 |          1        0.01       88.18
       8939 |        863        8.63       96.81
       8945 |          1        0.01       96.82
       9303 |          1        0.01       96.83
       9305 |          2        0.02       96.85
       9307 |         11        0.11       96.96
       9408 |          1        0.01       96.97
       9411 |         50        0.50       97.47
       9412 |          1        0.01       97.48
       9419 |         29        0.29       97.77
       9502 |          1        0.01       97.78
       9509 |        218        2.18       99.96
       9547 |          2        0.02       99.98
       9999 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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