Below is a graph from Example 32 of the User's Guide.
It shows the posterior distribution of the
regression weight for using
age to predict timesqr. The
graph shows everything that is known about the value of the
regression weight. There is about a 50-50 chance that
the regression weight is between -0.4 and -0.2. (About
half the area is in that range.) The regression weight
is almost guaranteed to be between -0.8 and 0.2.
