compute_AI {Ymisc}

The brain asymmetry index (AI)

Description

AI formula = [(left-right)/(left+right)]. compute_AI() creates new columns that are AIs of the brain measures using the most widely-used formula.

Usage

compute_AI(
  data = sample_data,
  left_hemisphere = "lh",
  right_hemisphere = "rh",
  separator = "_",
  ID = "ID",
  hemisphere = "prefix",
  start,
  end
)

Arguments

data

The wide format data

left_hemisphere

The prefix or suffix that indicates the left hemisphere in the variable names

right_hemisphere

The prefix or suffix string that indicates the right hemisphere in the variable names

separator

A character vector that separates characters in the variable names.

ID

The column of identifiers.

hemisphere

The character vector that indicates whether a hemisphere indicator in the variable names is a prefix or suffix.

start

The column that specifies the starting point of a set of variables to calculate the AIs.

end

The column that specifies the endpoint of a set of variables to calculate the AIs.

Value

The data with AIs.

Examples

data(sample_data)

compute_AI(sample_data,
left_hemisphere = "lh",
right_hemisphere = "rh",
separator="_",
ID="ID",
hemisphere="prefix",
start="lh_Thalamus",
end="rh_AccumbensArea")