Abstract
For a certain common type of experimental situation, the better the subject's performance — i.e., the more skilled he is, or the easier his task (perhaps due to good human-engineering design) — the more markedly skewed his distribution of scores tends to be and the more nonrobust parametric tests tend to be. So when performance conditions are optimal, test conditions tend to be pessimal and vice versa.
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More From: Human Factors: The Journal of the Human Factors and Ergonomics Society
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