Frequencies for first 10,000 rows of diagsc1 variable in namcs1996 dataset :

      other |
diag/screen |
 service #1 |
    - 4 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,991       99.91       99.91
       8908 |          1        0.01       99.92
       8915 |          3        0.03       99.95
       8937 |          1        0.01       99.96
       8954 |          1        0.01       99.97
       9505 |          1        0.01       99.98
       9506 |          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