Step C12: Viewing an HPD region for an estimate of the time elapsed
between two parameters

This page shows the 95% HPD region for an estimate of the time elapsed
between alpha 2 and phi 1. The result is two intervals 816 to 841
and 843 to 1472. This is really common in HPDs from radiocarbon calibration
and arises due to the `wiggly' nature of the calibration curves.
In this particular case, there are only 2 years between the end of one
interval and the start of the next. Given that the calibration curve
is decadal and that the errors on our radiocarbon determinations are large
this is an extremely short period of time. In reporting this HPD
region we would recommend rounding everything to the nearest ten years
so that the interval becomes 820 to 1,470 years.