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Helper Functions for fmri_ttest

Source: R/fmri_ttest_helpers.R
paired_diff_block.Rd

Support functions for paired differences, sign flipping, and wrapper functions for OLS and meta-analysis with voxelwise covariates. Compute Paired Within-Subject Differences

Usage

paired_diff_block(blkA, blkB, rho = 0)

Arguments

blkA

First group_data block

blkB

Second group_data block

rho

Optional within-subject correlation between A and B. Can be:

  • Scalar: Same correlation for all subjects and features

  • Vector of length S: Per-subject correlations

  • Vector of length P: Per-feature correlations

  • Matrix (S x P): Subject-feature specific correlations

Default is 0 (independence).

Value

A new block with Y = Y_A - Y_B and propagated variance if available

Details

Creates within-subject differences (A - B) for paired t-tests from two blocks with identical subjects and features.