Table 2.

Summary of the priors in the Bayesian model used to estimate the sensitivity of pooled and individual faecal sampling for detection of Salmonella

Parameter	Description	Prior	Source
πij	Salmonella prevalence on farm i and epidemiological group j.	Beta(1,1)	Uninformative
ηincl	Sensitivity of individual faecal samples	Beta(1,1)	Uninformative
C	Salmonella concentration in pig faeces	Normal(5,0·05)	Mean similar to Arnold et al. [7], but greater uncertainty
Ρ	Parameter determining how test sensitivity varies with C	Normal(0·5,0·12)	Mean similar to Arnold et al. [7], but greater uncertainty