Frequencies for first 10,000 rows of catmri variable in nhamcsopd1998 dataset :

catscan/mri |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,848       98.48       98.48
          1 |        152        1.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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