Frequencies for first 10,000 rows of mri variable in namcs2011 dataset : MRI | Freq. Percent Cum. ------------+----------------------------------- No | 9,884 98.84 98.84 Yes | 116 1.16 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016