fmriica {fmri}R Documentation

Independent Component Analysis

Description

The function performs Independent Component Analysis.

Usage

fmriica(data, m = 3, method = "spatial", xind = NULL, yind = NULL, zind = NULL, tind = NULL, ...)

Arguments

data Observation matrix (dimension Nxd)
m Number of independent components.
method Either "spatial" or "temporal". Specifies the type of ICA to perform.
xind index of x-coordinates to use
yind index of y-coordinates to use
zind index of z-coordinates to use
tind index of time points to use
... further arguments to fastICA

Details

This is still experimental code based on the package fastICA. The package fastICA seems limited in the data-size it can handle. xind, yind, zind and tind may be use to restrict the analysis to a cube in space and certain time points.

Value

The function returns a list with components

ihat Matrix containing the first m ICA directions as columns.
sdev Standard deviations of the principal components of the thresholded ICA directions
xhat first m components of the rotated data
v If keepv==TRUE the set of directions v^{(k)}
normv If keepv==TRUE the norm of each v^{(k)}.

Author(s)

J"org Polzehl polzehl@wias-berlin.de

See Also

ngca


[Package fmri version 1.2-6 Index]