On Tue, 17 Jan 2012, crimsonengineer87 wrote:
Thanks for the comments everyone. I was hoping to not have to find someone in
the stats department ... well, we'll see.
So in response to Z's comment ... I have tried breakpoints(Na ~ yield)
and I did expect to get something continuous.
You won't. The result may be close to continuous (depending on your data)
but there is no inherent continuity restriction.
That's what "segmented" does (that Rolf already pointed to). See
Vito M. R. Muggeo (2008). segmented: an R Package to Fit Regression Models
with Broken-Line Relationships. R News, 8/1, 20-25. URL
http://CRAN.R-project.org/doc/Rnews/.
The idea was to get two or three
linear functions making up the curve. And then from there, get a CI from
these lines. Of course, it wouldn't be good. (This is coming from a
non-stats guy ... I'm a civil engineer by degree and am now learning to be a
modeler as a grad student!). Do you know of any more examples of
breakpoints? The examples in the references are great, but I can't seem to
get it right.
Thanks again.
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