Table 1 Tested random and fixed effects in mixed effect logistic regression models with ELISA result and PCR result as outcome variables.
Random effects of mixed effect logistic regression models (with all fixed effects included) | ||
|---|---|---|
Outcome | Variable name | Explanation |
ELISA result (0/1 per pig) | 1 | farm | Random intercept per farm |
month–1 | farm | Random slope per farm | |
month | farm | Random intercept and slope per farm | |
(1 | farm / batch) | Random intercept per batch, nested in farm | |
PCR result (0/1 per batch) | 1 | farm | Random intercept per farm |
month–1 | farm | Random slope per farm | |
month | farm | Random intercept and slope per farm | |
Fixed effects (independent variables) of mixed effect logistic regression models | ||
ELISA result (0/1 per pig) | farm type | Conventional; organic; high health; HyCare |
ELISAtest | Original; alternative | |
PCR result (0/1 per batch) | farm type | Conventional; organic; high health; HyCare |
batch seropositive proportion | Between 0 and 1 per batch | |