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Fig. 3 | BMC Medical Research Methodology

Fig. 3

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

Fig. 3

Power curves for the continuous (Level 2) by categorical (Level 1) cross-level interaction. Benchmark conditions (normally-distributed Level 2 and balanced Level 1 predictors or ‘Benchmark’ in the figure legend) as well as moderate (skewness of \( \sqrt{8/5} \) and 70/30 imbalance) and extreme (skewness of \( \sqrt{8} \) and 90/10 imbalance) conditions are presented. The population ICC is 0.3 and the regression coefficients use a medium effect size of 0.3. Power of 80% is marked with a horizontal line. The horizontal axis denotes Level 1 sample size and the 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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