For models with no random effects, an analysis of deviance table is computed
using anova.glm()
. Otherwise, Wald tests are computed as
detailed here.
If a single object is specified, terms are added sequentially and a Wald
statistic is computed for the extra parameters. If the full model includes
player covariates and there are players with missing values over these
covariates, then the NULL
model will include a separate ability for
these players. If there are missing values in any contest-level variables in
the full model, the corresponding contests will be omitted throughout. The
random effects structure of the full model is assumed for all sub-models.
For a list of objects, consecutive pairs of models are compared by computing
a Wald statistic for the extra parameters in the larger of the two models.
The Wald statistic is always based on the variance-covariance matrix of the
larger of the two models being compared.