A decision tree can help you make tough choices between different paths and outcomes, but only if you evaluate the model correctly ... a specific price tag. Label the likelihood of each outcome.

A 15ft (4.5m) tree displayed in Clacton, Essex in 2013 was labelled "a twig" by critics and replaced. This year's effort, a 30ft (9m) high Norwegian spruce has been decorated with more than 8,000 ...