Frequencies for first 10,000 rows of depress variable in nhamcsopd2007 dataset :

 depression |
  screening |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,840       98.40       98.40
        yes |        160        1.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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