Frequencies for first 10,000 rows of othultra variable in namcs2014 dataset :

      Other |
 ultrasound |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,595       95.95       95.95
        Yes |        405        4.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017