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arXiv · 2009.07564

Argus: Interactive a priori Power Analysis

Xiaoyi Wang·Alexander Eiselmayer·Wendy E. Mackay·Kasper Hornbæk·Chat Wacharamanotham
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Abstract

A key challenge HCI researchers face when designing a controlled experiment is choosing the appropriate number of participants, or sample size. A prior power analysis examines the relationships among multiple parameters, including the complexity associated with human participants, e.g., order and fatigue effects, to calculate the statistical power of a given experiment design. We created Argus, a tool that supports interactive exploration of statistical power: Researchers specify experiment design scenarios with varying confounds and effect sizes. Argus then simulates data and visualizes statistical power across these scenarios, which lets researchers interactively weigh various trade-offs and make informed decisions about sample size. We describe the design and implementation of Argus, a usage scenario designing a visualization experiment, and a think-aloud study.

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Xiaoyi Wang, Alexander Eiselmayer, Wendy E. Mackay, Kasper Hornbæk, Chat Wacharamanotham. 2020-09-16. Argus: Interactive a priori Power Analysis. https://arxiv.org/abs/2009.07564

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