Table 3.

Rejection rate and α estimates for data simulated under a constant‐rate Brownian model on trees simulated under time‐variable speciation rates

Tree type	Tree size	Rejection rate	Median α (95% quantiles)
Slow speed‐up	25	0.126	0.443 (0–3.18)
Slow speed‐up	50	0.118	0.34 (0–1.963)
Slow speed‐up	100	0.105	0.22 (0–1.324)
Slow speed‐up	150	0.098	0.189 (0–1.113)
Slow speed‐up	200	0.085	0.162 (0–0.9)
Slow speed‐up	500	0.061	0.096 (0–0.545)
Slow speed‐up	1000	0.061	0.065 (0–0.415)
Rapid speed‐up	25	0.191	0.882 (0–7.012)
Rapid speed‐up	50	0.136	0.603 (0–4.082)
Rapid speed‐up	100	0.122	0.527 (0–3.024)
Rapid speed‐up	150	0.122	0.442 (0–2.485)
Rapid speed‐up	200	0.086	0.349 (0–2.01)
Rapid speed‐up	500	0.079	0.241 (0–1.437)
Rapid speed‐up	1000	0.069	0.183 (0–1.083)
Slow slow‐down	25	0.112	0.278 (0–1.792)
Slow slow‐down	50	0.082	0.14 (0–0.985)
Slow slow‐down	100	0.073	0.091 (0–0.549)
Slow slow‐down	150	0.053	0.055 (0–0.388)
Slow slow‐down	200	0.064	0.05 (0–0.349)
Slow slow‐down	500	0.05	0.028 (0–0.209)
Slow slow‐down	1000	0.042	0.017 (0–0.146)
Rapid slow‐down	25	0.093	0.192 (0–1.45)
Rapid slow‐down	50	0.077	0.118 (0–0.854)
Rapid slow‐down	100	0.058	0.061 (0–0.408)
Rapid slow‐down	150	0.064	0.038 (0–0.329)
Rapid slow‐down	200	0.051	0.029 (0–0.278)
Rapid slow‐down	500	0.036	0.014 (0–0.147)
Rapid slow‐down	1000	0.054	0.006 (0–0.11)

The rejection rate is the proportion of Ornstein Uhlenbeck models favoured relative to a Brownian motion model.