Frequencies for first 10,000 rows of diagscrn variable in nhamcsopd1997 dataset :

       were |
diag/screen |
   services |
ordered/pro |
     vided? |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      2,573       25.73       25.73
        Yes |      7,412       74.12       99.85
  No answer |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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