- Oct 3, 2001Dear all,
In relation to my research on behaviour within fishing fleets I would like
to ask a question. I am looking for the spatio-temporal correlation of
fishermen's catch rates. As I understand it now, the predictive power of a
spatial pattern in catch rates in one week on the pattern in the next week
estimated using cross-semivariograms (GSLIBS gamv), with head in timestep t
and tail in timestep t-1. Unfortunately the data I have comes from a fleet,
not a survey design, and the position of the catch rates estimates is not
fixed. Therefor I am left with very few actual positions where I have a
catch rate for both weeks, and a lot where either is missing.
Is there a way to calculate the predictive power of a spatial pattern in one
timestep on the spatial pattern in another? Is trying to calculate the
cross-semivariogram the right way? Am I doing something wrong or overlooking
something? I am very new to geostatistics, so any help is welcome.
With kind regards,
Jan Jaap Poos
University of Groningen, department of animal ecology
Netherlands Institute for Fisheries Research
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