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Fig. 2 | BMC Medical Research Methodology

Fig. 2

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

Fig. 2

Power curves for the binary categorical, Level 1 predictor. Conditions of balance (‘Balance’ in the figure legend or 50/50), moderate (‘Mod. Imblanace’ in the figure legend or 70/30 ) and extreme (‘Extr. Imbalance in the figure legend or 90/10) imbalance are presented. The population ICC is 0.3 and the regression coefficients use a medium effect size of 0.5. 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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