These are methods for the functions anova
or summary
for objects inheriting from class `Gam'.
See anova
for the general behavior of this function
and for the interpretation of `test'.
When called with a single `Gam' object, a special pair of anova tables for `Gam'
models is returned. This gives a breakdown of the degrees of freedom for
all the terms in the model, separating the projection part and
nonparametric part of each, and returned as a list of two anova objects. For example, a term specified by `s()' is
broken down into a single degree of freedom for its linear component,
and the remainder for the nonparametric component. In addition, a type
of score test is performed for each of the nonparametric terms. The
nonparametric component is set to zero, and the linear part is updated,
holding the other nonparametric terms fixed. This is done efficiently
and simulataneously for all terms.