Citation

Donmez B, Boyle LN, Lee JD. Proc. Hum. Factors Ergon. Soc. Annu. Meet. 2006; 50(21): 2336-2339.

Copyright

(Copyright © 2006, Human Factors and Ergonomics Society, Publisher SAGE Publishing)

DOI

10.1177/154193120605002108

PMID

unavailable

Abstract

Driving simulator studies are usually designed to collect repeated measures on each participant. This design has different implications for the power of within and between-subject effects that needs to be recognized by researchers. The power for between-subject variables decreases when additional measures are collected on the within-subject variables. However, the power for the main and interaction effects of the within-subjects variables increases as more observations are collected on one participant. If the main interest of the experiment is a between-subject effect, such as age, then a completely randomized design can provide the same power with fewer participants. Through a case study, this paper demonstrates how the power changes between a repeated measures design and a completely randomized design.

Language: en