Hi
Threshold models with time series for ecology have been quite famous with
bookf from Tong (1990, nonlinear time series), who studied lynx population
and showed evidence of threshold (regime specific) effects, and built a
model called "threshold autoregressive"
Many of those functions are avai
Hi Jonathan,
I don't know if I got the point, but for thresholds assessments, give a look
at segmented package.
bests
milton
brazil=toronto
On Tue, Jun 16, 2009 at 5:23 PM, Jonathan Greenberg
wrote:
> Rers:
>
> I have some ecological data (stream velocity vs. % cover of submerged
> weeds) that
Rers:
I have some ecological data (stream velocity vs. % cover of submerged
weeds) that shows strong evidence of a thresholding step-function, e.g.
below some velocity, % cover ranges from 0% to 100% (with no apparent
relationship to velocity within this range of velocities), but above a
cert
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