Frequencies for first 10,000 rows of diagsc1 variable in namcs1995 dataset :

      other |
diag/screen |
 service #1 |
    - 4 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,996       99.96       99.96
       8937 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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