Builds the trend matrix according to the specification
of the mean part of the model provided by the user.
Usage
trend.spatial(trend, coords = NULL)
Arguments
trend
specifies the mean part of the model. The options are:
"cte" (constant mean - default option),
"1st" (a first degree polynomial
on the coordinates), "2nd" (a second degree polynomial
on the coordinate
coords
an $n \times 2$ matrix containing in each row Euclidean
coordinates. Needs to be provided only if trend = "1st" or
trend = "2nd".
Value
An $n \times p$ trend matrix where $n$
is the number of spatial
locations and $p$ is the number of mean parameters in the model.
References
Further information about geoR can be found at:
http://www.maths.lancs.ac.uk/~ribeiro/geoR.html.