Frequencies for first 10,000 rows of examwi1 variable in nhamcsopd2002 dataset :

       exam |
write-in #1 |
  - 4 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      6,983       69.83       69.83
       7534 |         23        0.23       70.06
       8902 |         26        0.26       70.32
       8906 |          1        0.01       70.33
       8908 |         11        0.11       70.44
       8909 |          3        0.03       70.47
       8913 |        394        3.94       74.41
       8915 |         10        0.10       74.51
       8919 |          1        0.01       74.52
       8924 |          1        0.01       74.53
       8926 |        523        5.23       79.76
       8931 |          5        0.05       79.81
       8934 |         63        0.63       80.44
       8936 |        340        3.40       83.84
       8937 |          1        0.01       83.85
       8939 |        971        9.71       93.56
       8944 |          1        0.01       93.57
       8950 |          1        0.01       93.58
       8959 |          2        0.02       93.60
       9401 |          1        0.01       93.61
       9408 |         46        0.46       94.07
       9411 |          4        0.04       94.11
       9419 |         13        0.13       94.24
       9502 |          9        0.09       94.33
       9505 |          3        0.03       94.36
       9509 |        302        3.02       97.38
       9547 |        128        1.28       98.66
       9549 |          1        0.01       98.67
       9999 |        133        1.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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