Frequencies for GC_CHF_COPD variable in hcccoefn dataset :

GC_CHF_COPD |      Freq.     Percent        Cum.
------------+-----------------------------------
       .255 |          1      100.00      100.00
------------+-----------------------------------
      Total |          1      100.00

by Jean Roth , jroth@nber.org , 23 Mar 2017