Frequencies for first 10,000 rows of diagsc12 variable in nhamcsopd1995 dataset :

      other |
diag/screen |
 service #1 |
    - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,995       99.95       99.95
         87 |          1        0.01       99.96
         89 |          1        0.01       99.97
         91 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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