meigen0 {spmoran}

Nystrom extension of Moran eigenvectors

Description

This function estimates Moran eigenvectors at unobserved sites using the Nystrom extension.

Usage

meigen0( meig, coords0, s_id0 = NULL )

Arguments

coords0

Matrix of spatial point coordinates of unobserved sites (N_0 x 2)

meig

Moran eigenvectors and eigenvalues. Output from meigen or meigen_f

s_id0

Optional. ID specifying groups modeling spatial effects (N_0 x 1). If specified, Moran eigenvectors are extracted by groups. It is useful e.g. for multilevel modeling (s_id is the groups) and panel data modeling (s_id is given by individual location id). Default is NULL

Value

sf

Matrix of the first L eigenvectors at unobserved sites (N_0 x L)

ev

Vector of the first L eigenvalues (L x 1)

ev_full

Vector of all eigenvalues (N x 1)

other

List of other outputs, which are internally used

Author(s)

Daisuke Murakami

References

Drineas, P. and Mahoney, M.W. (2005) On the Nystrom method for approximating a gram matrix for improved kernel-based learning. Journal of Machine Learning Research, 6 (2005), 2153-2175.

See Also

meigen, meigen_f