[R] model II major axis regression

[garth]

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,
Dan.
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