Hi all,

I’ve just started to learn working with R.

I wonder if it is possible to make a ‘temporal correlogram’ in R and how to
do it. Actually what I have are movement tracks of birds, existing as
XY-positions every 5 minutes for a duration of at least 60 minutes (but up
to 8 hours). From these tracks, I calculated step lengths (ie distances
travelled within each 5 min-step) and turning angles (also per 5 min-step)
for each ‘tracking session’ (I tracked each individual bird several times).
I manually calculated the correlation between step-legths at time t and
t+5min and they are strongluy correlated. I want to know for how many time
steps this correlation holds. Therefore,I want to calculate autocorrelations
(between step lengths, between turning angles - and eventually also between
step lengths and turning angles, but that’s more complex) for subsequent
steps (so I need a moving window frame for delta time/step). On the Y-axis,
I would then have rho (autocorrelation coefficient for step length or
turning angle), and on the X-axis, delta time (as time steps 0, 5, 10,15,
... minutes). Ideal would be to have the average rho + CI (or SD) displayed
over all individuals (or tracking sessions). Is there a package to do this i
R? I searched the web but found only correlograms for spatial data
(sncf-package), not temporal.

 

Thank you very much for your kind assistance!

Valérie

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Valérie Lehouck

Assistant Professor

Research Unit Terrestrial Ecology

Ghent University

KL Ledeganckstraat 35

9000 Ghent

Belgium

Tel.: +32(0)9/264 52 58

website: http://www.ecology.ugent.be/terec/personal.php?pers=vl




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