search for: mottle3

...s of flowers bought on various days deltaP = a vector of the differences between the purchase price and the posted price on those days Two simple models might be: mottle1 = lm( deltaP ~ amt ) or mottle2 = lm( deltaP ~ amt - 1 ) But, I have the urge to set the model up as follows mottle3 = lm( deltaP ~ amt - 1, weights = amt ) because I want the big purchases to weigh much more in the calculation of the slope than the small purchases, but I have an uneasy feeling that this amounts to double-dipping/counting. Can anyone explain to me if/why this is a bad idea? Thanks, D...