Frequencies for first 10,000 rows of mri variable in namcs2013 dataset :

        MRI |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,828       98.28       98.28
        Yes |        172        1.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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