object of class gstat, used to
extract ids; may be missing if ids is used
X
contrast vector or matrix; the number of variables in
gstat.object should equal the number of elements in X
if X is a vector, or the number of rows in X if X
is a matrix.
ids
character vector with (selection of) id names, present in data
Details
From data, we can extract the n x 1 vector with multivariable
predictions, say $y$, and its n x n covariance matrix $V$. Given
a contrast matrix in $X$, this function computes the contrast vector
$C=X'y$ and its variance $Var(C)=X'V X$.
Value
a data frame containing for each row in data the generalized
least squares estimates (named beta.1, beta.2, ...), their
variances (named var.beta.1, var.beta.2, ...) and covariances
(named cov.beta.1.2, cov.beta.1.3, ...)