
Dear R,
I am currently trying to caculate the coefficient of determination for different quantile regression models. For example

fit<-rq(Hrubra~SessileInvertebrates,tau=0.8, data=Q1) 
fit1<-rq(Hrubra~SessileInvertebrates,tau=0.8, data=Q2)
etc 

Could someone please advise me how do you calculate the the sum of the weighted absolute deviations in the models for the formula

R = 1-(Sum(f)/Sum(r))

I have looked all through the help files but the only example I can find is in Stata.
Thanks in advance
Beth Strain


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