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Example 29
Most of the area lies to the left of 0, meaning that the difference is almost sure to be
negative. In other words, it is almost certain that the indirect effect is more negative
than the direct effect. Eyeballing the posterior, perhaps 95% or so of the area lies to the
left of 0, so there is about a 95% chance that the indirect effect is larger than the direct
effect. It is not necessary to rely on eyeballing the posterior, however. There is a way
to find any area under a marginal posterior or, more generally, to estimate the
probability that any proposition about the parameters is true.