Frequencies for gc_hcc119 variable in hcccoefn dataset :

proliferati |
ve diabetic |
    retinop |      Freq.     Percent        Cum.
------------+-----------------------------------
       .278 |          1      100.00      100.00
------------+-----------------------------------
      Total |          1      100.00

by Jean Roth , jroth@nber.org , 2 May 2016