leverage {fMRIscrub}

Leverage

Description

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

Usage

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

Arguments

Comps

The n by Q PC score matrix/IC mixing matrix.

are_norm

Assume the columns of Comps are orthogonal and have 2-norms equal to 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.