8.7 Exercises on Chapter 8
1. Show that the prior

suggested in connection with the example on risk of tumour in a group of rats is equivalent to a density uniform in

.
2. Observations
x1,
x2, … ,
xn are independently distributed given parameters

,

, … ,

according to the Poisson distribution

. The prior distribution for

is constructed hierarchically. First, the

s are assumed to be independently identically distributed given a hyperparameter

according to the exponential distribution

for and ...