Table 5 Results of zero-inflation Poisson regression modelling for the offset-model (Model 1: offset if log-size of holding), for the model treating log-size as a free covariate (Model 2) and the model with a quadratic term included (Model 3) based upon the CSFS data without index cases in the case count (n = 214).
From: On the question of proportionality of the count of observed Scrapie cases and the size of holding
Model 1 | coefficient | S.E. | Z = coeff./S.E. | log-likelihood (AIC, BIC) |
|---|---|---|---|---|
α | -6.0402 | 0.0981 | -61.55 | -236.27 |
β 1 | 1 (fixed) | (476.54, 483.27) | ||
Model 2 | coefficient | S.E. | Z = coeff./S.E. | log-likelihood (AIC, BIC) |
α | -4.0355 | 0.2789 | -5.54 | -232.63 |
β 1 | 0.7140 | 0.1043 | 6.84 | (471.27, 481.37) |
Model 3 | coefficient | S.E. | Z = coeff./S.E. | log-likelihood (AIC, BIC) |
α | 2.1013 | 1.1687 | 1.80 | -223.99 |
β 1 | -1.3656 | 0.0333 | 5.07 | (455.99. 469.45) |
β 2 | 0.1686 | 0.0270 | -1.24 |