poly_contrast: Polynomial Contrast

In bbuchsbaum/fmrireg: R package for the anlysis of fmri data

Polynomial Contrast

Description

Create a polynomial contrast evaluated over a set of (orderable) factor levels.

Usage

poly_contrast(A, name, where = NULL, degree = 1, value_map = NULL)

Arguments

A	A formula describing the contrast.
name	A character string representing the name of the contrast.
where	An optional formula defining the subset over which the contrast is computed.
degree	An integer representing the degree of the polynomial (default: 1).
value_map	An optional list that maps between levels of a factor and a numeric value.

Value

A list containing the polynomial contrast specification.

Examples

pcon <- poly_contrast(~ time, name="poly_time_3", degree=3)

bbuchsbaum/fmrireg documentation built on May 16, 2023, 10:56 a.m.