Frequencies for first 10,000 rows of othultra variable in nhamcsopd2009 dataset :

      other |
 ultrasound |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,616       96.16       96.16
        yes |        384        3.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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