Frequencies for di_cancer_immune variable in hcccoefn dataset :

di_cancer_i |
      mmune |      Freq.     Percent        Cum.
------------+-----------------------------------
       .025 |          1      100.00      100.00
------------+-----------------------------------
      Total |          1      100.00

by Jean Roth , jroth@nber.org , 7 Feb 2019