Hi all - I have been looking on-line for an answer but cannot find one thus
far, and was hoping anyone could be so kind to assist with some suggestions.
I have biological data of body size (y) over time (x), and after a preliminary
inspection using a scatter plot the data suggest the body size is declining. I
used a linear regression to confirm this, however, now I would like to examine
what sort of underlying regression equation I can use to describe this decline,
i.e., how do I get the parameters for the equation and for a more fitting curve
(better than the loess)? I could not find anything online on this so far.
The curve is what I call a "reversed growth curve", and I also would like to
examine at what year the decline is 5% or greater from the horizontal/asymptote
(if that makes sense)......
thank you for any suggestions on this......m
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