latinSquareDigram: Create a digram-balanced latin square

In drknexus/repsych: Package for reproducible psychological research

Description

This function creates a digram-balanced latin square as described in Keppel & Wickens, 2004 pg 384-386. The condition orders for subjects are listed by rows, such that row one is the order of conditions for subject 1, and so on. This method of counter-balancing is preferred to so-called cyclic counter-balancing because it balances the order of presentation such that conditions occur in each position equally and they also balance the order of presentation such that each condition occurs before and after each other presentation an equal number of times. See Keppel & Wickens, 2004 for details.

Usage

latinSquareDigram(conds)

Arguments

conds

A vector of condition IDs or condition names

Value

(list) Digram balanced latin squares come in pairs when there are an odd number of conditions, but only one square when there are an even number of conditions. This function returns a list with a square (in a matrix) for each item.

Author(s)

Russell S. Pierce [e-mail]

References

Keppel & Wickens, 2004 pp 384-386

Examples

latinSquareDigram(1:3)
latinSquareDigram(LETTERS[1:4])

drknexus/repsych documentation built on May 15, 2019, 2:19 p.m.