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Fig. 14 | BMC Medical Research Methodology

Fig. 14

From: The relationship between statistical power and predictor distribution in multilevel logistic regression: a simulation-based approach

Fig. 14

Power curves for the variance component of the random intercept are presented, now for a Level 1 (continuous) and Level 2 (categorical) predictors. Moderate (skewness of \( \sqrt{8/5} \) and 70/30 imbalance) and extreme (skewness of \( \sqrt{8} \) and 90/10 imbalance) simulation conditions are shown. Variance for the random intercept is \( {\sigma}_0^2=\frac{\pi^2}{7} \) for an ICC of 0.3 (medium effect size). Power of 80% is marked with a horizontal line. Horizontal axis denotes Level 1 sample size and vertical axis shows power. Level 2 sample sizes are shown on top of each panel in grey. LV1 stands for Level 1 and LV2 stands for Level 2

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BMC Medical Research Methodology

ISSN: 1471-2288

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