Fig 5. The relationship of statistical power and sign error with sample size in the categorical meta-analysis power analysis of curtailment studies.

We examined the relationship between the number of studies per category of Δ cut-in speed (Category 1 = β₀ = 0.5–1.3 m/s Δ cut-in speed, Category 2 = β₁ = 1.5–2.3 Δ cut-in speed, Category 3 = β₂ = 3–3.5 m/s Δ cut-in speed) and 1) the statistical power to detect change between categories (top), and 2) the rate at which models would be expected to incorrectly predict the sign of parameter estimates (bottom). Colors represent different curtailment regime scenarios. The horizontal dashed lines represent the 0.8 power threshold and 50% sign error threshold, respectively.