hi,
 
a) i have something like:
 
ecdfgrp1<-ecdf(subset(mydata,TMT_GRP==1)$Y);

ecdfgrp2<-ecdf(subset(mydata,TMT_GRP==2)$Y);

how can i plot the difference between these 2 step functions?
 
i could begin with ecdfrefl<-function(x){ecdfgrp2(x)-ecdfgrp1(x);} ...
what next?
 
b) if i have a vector with repeated numeric values how can i get the
subset without repeated values .e.g (0,4,0,2,2) ----> (0,4,2) ?
 
thanks!

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