Learn R Programming

brainwaver (version 1.6)

Basic wavelet analysis of multivariate time series with a visualisation and parametrisation using graph theory.

Description

This package computes the correlation matrix for each scale of a wavelet decomposition, namely the one performed by the R package waveslim (Whitcher, 2000). An hypothesis test is applied to each entry of one matrix in order to construct an adjacency matrix of a graph. The graph obtained is finally analysed using the small-world theory (Watts and Strogatz, 1998) and using the computation of efficiency (Latora, 2001), tested using simulated attacks. The brainwaver project is complementary to the camba project for brain-data preprocessing. A collection of scripts (with a makefile) is avalaible to download along with the brainwaver package, see information on the webpage mentioned below.

Copy Link

Version

Install

install.packages('brainwaver')

Monthly Downloads

58

Version

1.6

License

GPL (>= 2)

Maintainer

Last Published

December 2nd, 2012

Functions in brainwaver (1.6)

small.world

Computation of some quantitive parameters given in the framework of the small-world graph theory.
choose.thresh.nbedges

Threshold associated to a given number of edges.
const.adj.list

Computation of the list of adjacency matrices
p.value.compute

Computation of the p-value for a given hypotheses test
const.cor.list

Computation of the list of correlation matrices
const.adj.mat

Computation of the adjacency matrix
correlations.to.adjacencies

Produce adjencency matrices for a given number of edges
graph.attack

Attack of graphs
equadist.rand.sw

Small-world parameters for a simulated graph given its degree distribution
sim.graph

Simulation of graphs
efficiency

Graph efficiency
rand.eff

Efficiency for simulated graphs
compute.FDR

False Discovery Rate computation
const.var.list

Computation of the list of variance vectors
reg.sw

Small-world parameters for a lattice graph
fitting

Fitting laws with maximum likelihood
brain

Time series obtained by an fMRI experiement on the brain
young

Time series obtained by an fMRI experiement on the brain
read.var.txt

Exportation and importation internal objects.
read.convert_1_2

Conversion of already edited objects from version 1 to 2
read.cor.txt

Exportation and importation of internal objects.
wave.trans

Computation of the wavelet transform
rand.sw

Small-world parameters for simulated random graphs