Frequencies for first 10,000 rows of mricat variable in nhamcsed2001 dataset :

    mri/cat |
       scan |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,389       93.89       93.89
          1 |        611        6.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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