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Table 6 Comparison of the quality of the model fit for different model alternatives

From: Breeding with resistant rams leads to rapid control of classical scrapie in affected sheep flocks

Description of model variant Number of free parameters Pearson's Chi-square statistic P value for Goodness of fit
(i) Model I (Eq. (3)) 3 8.9 0.06
(ii) Model II (Eq. (4)) 4 8.1 0.09
(iii) Model III (Eq. (5)) 4 3.1 0.38