leverage: Leverage

In neuroconductor/fMRIscrub: Scrubbing and Other Data Cleaning Routines for fMRI

Description

Computes the leverage of each observation in the PC score / IC mixing matrix (U/M) for projection scrubbing. Optionally can threshold the leverage values to flag potential outliers.

Usage

leverage(Comps, are_orthogonal = FALSE, median_cutoff = NULL)

Arguments

Comps	The n by Q PC score matrix/IC mixing matrix.
are_orthogonal	Can the columns of Comps be assumed to be orthogonal and have a 2-norm of 1? Speeds up the computation.
median_cutoff	The outlier cutoff, in multiples of the median leverage. Default: NULL (do not compute outliers).

Value

A list with entries "meas" (the leverage values), "cut" (the leverage cutoff value) and "flag" (logical vector indicating the outliers). If !is.null(median_cutoff), "cut" and "flag" are omitted.

neuroconductor/fMRIscrub documentation built on Dec. 22, 2021, 1:10 a.m.