Frequencies for first 10,000 rows of anyimg variable in nhamcsopd2001 dataset :

any imaging |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,630       86.30       86.30
          1 |      1,370       13.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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