[R] model II major axis regression

garth dboyce at dal.ca
Tue Feb 9 18:18:21 CET 2010

Hello all; My question is part statistical and part R. 

I have performed model II major axis regression in R using both the smatr()
and lmodel2() packages, but neither offers an option to statistically weight
my regression. I have a vector of weights which I would like to apply to
each of my regression points (x vs. y), and was hoping that someone out
there could provide me with some help on this issue. I have searched on the
R help pages and online with no luck.

Just to provide context, I am comparing 2 random variables which have been
geographically gridded so that each grid point has one x data and one y data
point. I would like to weight the regression of x vs. y such that grids with
larger geographic area (near the equator) get more weight than those with
smaller geographic area (near the poles). My weights are already calculated. 

Thanks in advance,
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