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hierband (version 1.0)

Convex Banding of the Covariance Matrix

Description

Implementation of the convex banding procedure (using a hierarchical group lasso penalty) for covariance estimation that is introduced in Bien, Bunea, Xiao (2015) Convex Banding of the Covariance Matrix. Accepted for publication in JASA.

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Version

Install

install.packages('hierband')

Monthly Downloads

15

Version

1.0

License

GPL-3

Maintainer

Jacob Bien

Last Published

June 12th, 2015

Functions in hierband (1.0)

hierband

Solves main optimization problem for fixed lambda value
ma

Covariance of an equal-weighted moving-average process
subdiag.thresh

Performs a single pass of BCD on a matrix R.
hierband-package

Convex banding of the covariance matrix using
hierband.path

Solves main optimization problem over a grid of lambda values
gpband

Groupwise soft-thresholds subdiagonals by lam * w
formw

Form the "general weights" matrix
subdiagonal.l2norms

Compute the L2 norm of each subdiagonal of a symmetric matrix R.
lam.max.hierband

Computes the smallest lambda such that P=0.
MakeFolds

Make folds for cross validation
hierband.cv

Performs nfolds-cross validation
banded

Generates a banded covariance matrix and matrix squareroot sig: value of kth band (starting with diagonal) size of band is length(sig)