centered_contrasts {hypr}

Contrast centering

Description

Centeredness of contrasts is critical for the interpretation of interactions and intercepts. There are functions available to check for centered contrasts and to realign contrasts so that they are centered.

Usage

centered_contrasts(x)

is_centered(x)

all_centered(x, ignore_intercept = TRUE)

which_centered(x)

Arguments

x

A hypr object

ignore_intercept

If TRUE, the intercept is ignored

Details

The function centered_contrasts(x) will return a copy of x where all contrasts were centered to a zero mean.

The functions is_centered(x) and which_centered() indicate which contrasts of x, are centered. all_centered(x) will return TRUE if all contrasts in x are centered or FALSE if at least one contrast is not.

Value

A centered set of hypr contrasts (centered_contrasts), a single logical value (all_centered), a logical vector (is_centered), or an integer index vector (which_centered)

Functions

• is_centered(): Check which contrasts of x are centered

• all_centered(): Check whether all contrasts of x are centered

• which_centered(): Check which contrasts of x are centered