Frequencies for first 10,000 rows of urine variable in nhamcsed2007 dataset :

 urinalysis |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,607       76.07       76.07
        yes |      2,393       23.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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