Summary of log-linear models.

We compared the fit of seventeen possible models for our data, considering all combinations of single factor effects with two- and three-way interactions. For each model, an x denotes that a given factor or interaction was included. The number of parameters for each model is given. In some cases, certain parameters were redundant, and are not included in this count. AIC scores, delta-AIC values, and Akaike weights are given in the last three columns. A model including all two-way interactions but no three-way interaction term is strongly favored by the data.