metricT: Directional Fragility Diagnostics for EEG Connectivity
Implements Metric-T, a permutation-based diagnostic that flags
when the reported direction of a group difference in
electroencephalography (EEG) functional connectivity depends on the
choice of metric. Direction consistency (DC)
converts the weighted phase lag index (wPLI) and magnitude-squared
coherence (MSC), both derived from the same cross-spectrum, into the
percentage of channel-pair features for which one group exceeds the
other; Metric-T is T = DC(wPLI) - DC(MSC). Significance is assessed by
aligned label permutation with marginal and Westfall-Young max-T
multiplicity control. For small samples the reference set is enumerated
completely: exact two-group tests, the complete two-group labelling
space (in which cut-points, exclusions and batches are located on one
distribution), and a stratified exact test for a continuous covariate.
Core functions use base R only; a 'shiny' graphical interface is
included. Method: Kimura (2026) <doi:10.1016/j.neuri.2026.100286>.
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