Table 2 Descriptions of baseline model parameters used to compare the true and apparent liter prevalence of PRRSV
Parameter/variable | Distribution/function | Description | Source |
|---|---|---|---|
\(p\) | Fixed = (range of values from 1 to 100%) | Probability of a piglet being positive in a room (prevalence) | Authors’ opinion |
\(N\) | \(p \cdot T\) | Total number of positive piglets in the room | Calculation |
\(T\) | \(\mathop \sum \limits_{i = 1}^{n} T_{i}\) | Total number of piglets in the room | Calculation |
\(T_{i}\) | empirical {(), ()}* | Number of piglets in the i-th litter | |
\(n\) | Fixed = 56 | Number of crates or litters in a room | Authors’ opinion |
\(N_{i}\) | \(min \left\{ {Bin\left[ {\left( {N - \mathop \sum \limits_{j = 1}^{i - 1} N_{j} , pl} \right)} \right],{\text{T}}_{{\text{i}}} } \right\}\) | Number of positive piglets in i-th litter | Calculation |
\(pl_{i}\) | \(\frac{{{\text{T}}_{{\text{i}}} }}{{T - \mathop \sum \nolimits_{j = 1}^{i - 1} T_{j} }} + \left( {1 - \frac{{{\text{T}}_{{\text{i}}} }}{{T - \mathop \sum \nolimits_{j = 1}^{i - 1} T_{j} }}} \right) \cdot c\) | Probability of success in this binomial process (i.e., allocation of positive piglets in a litter) for the i-th litter | Calculation |
\(c\) | Fixed = 0.61 | Clustering factor | Optimized based on Almeida et al. [30] |