Frequencies for first 10,000 rows of examwi2r variable in nhamcsopd2001 dataset :

       exam |
write-in #2 |
   - recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,124       91.24       91.24
       8913 |         86        0.86       92.10
       8926 |        261        2.61       94.71
       8934 |         35        0.35       95.06
       8936 |         13        0.13       95.19
       8939 |        268        2.68       97.87
       8962 |          1        0.01       97.88
       9149 |          1        0.01       97.89
       9408 |          2        0.02       97.91
       9411 |         43        0.43       98.34
       9503 |          2        0.02       98.36
       9505 |          2        0.02       98.38
       9509 |        153        1.53       99.91
       9511 |          7        0.07       99.98
       9547 |          1        0.01       99.99
       9999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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