Figure 4

Probability of a herd becoming infected versus six herd characteristics. Each point represents a single herd. Red lines correspond to the prediction of the generalized linear model with a logit link and the logarithm of the herd characteristic (in-degree (A), out-degree (B), in-strength (C), out-strength (D), number of males purchased (F)) or the herd characteristic (herd size (E)) as explanatory variable. For the definition of the probability of a herd becoming infected see text.