This function converts an object of class demonoid.val to an
object of class demonoid.ppc.
as.ppc(x, set=3)This is an object of class demonoid.val.
This is an integer that indicates which list component is
to be used. When set=1, the modeled data set is used. When
set=2, the validation data set is used. When set=3,
both data sets are used.
The returned object is an object of class demonoid.ppc.
After using the Validate function for holdout
validation, it is often suggested to perform posterior predictive
checks. The as.ppc function converts the output object of
Validate, which is an object of class
demonoid.val, to an object of class demonoid.ppc. The
returned object is the same as if it were created with the
predict.demonoid function, rather than the
Validate function.
After this conversion, the user may use posterior predictive checks,
as usual, with the summary.demonoid.ppc function.