SUPPLEMENTARY APPENDIX 6. Accuracy and precision of date estimates for different species/FBD trees.

Estimates are reported for origin time (tor), root age (tmrca), and crown age (tc) in the core analyses. (a) Accuracy is measured by relative bias (distance between posterior median and true value, divided by the true value). (b) Precision is measured by relative 95% credibility interval (CI) width (posterior 95% CI width divided by the true value). Under each of the four fossil occurrence probabilities (P = 0.01, 0.02, 0.05, and non-uniform), boxplots are shown for each of the 20 species trees, ordered from left to right by increasing tor. Each boxplot summarizes the results from nine analyses for a single species tree.