On Oct 7, 2011, at 11:54 AM, Joanie wrote:
Hi,
my question is really precise.
I'm interested in drops of stomacal temperature (of seal pups)
following
milk ingestion. Temperature starts at an average of 37.8oC (sd=0.2)
and
drops rapidly to around 36.0oC and then stabilizes slowly to a
temperature
silimar to the previous one. It looks a bit like an inverse skewed
bell
curve.
I want to find different points on that curve, and I have a hard
time trying
to code one of them.
I want to determine the point after ingestion (after the temperature
drop)
where the temperatures reaches stability, i.e. where temperature is
stable
to plus or minus 1 sd for a period of 10 minutes or more. I have
data almost
every second and I calculated that a 10 minutes period corresponded
to an
average of 400 lines.
You would get much better advice if you posted a sample. 400 data
points is not very big.
Also, I want to determine the area under the curve, i.e. the area
enclosed
by the inverse skewed curve (which I don't know the equation).
Wouldn't that just be:
sum(vec-vec[1])
--
David Winsemius, MD
West Hartford, CT
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