2.2.4. Sensitivity analysis
A sensitivity analysis was performed to investigate the impact of
the assumptions made in developing the model.
The first issue was the choice of prior distributions. In the absence
of other distributional information, the adoption of normal prior distribution
for the location parameters appears satisfactory. An alternative
possibility is to use uniform priors on the standard deviations. In
order to assess the impact of this choice, the model was re-analyzed,
replacing the inverse gamma priors on the precisions ξ (ξ=1/ σs
2)
with over-dispersed but proper uniform distributions on the standard
deviations.