Frequencies for first 10,000 rows of depress variable in nhamcsopd2006 dataset :

 depression |
  screening |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,841       98.41       98.41
        Yes |        159        1.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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