Frequencies for first 10,000 rows of diagsc12 variable in namcs1996 dataset :

      other |
diag/screen |
 service #1 |
    - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,991       99.91       99.91
         89 |          6        0.06       99.97
         95 |          2        0.02       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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