stacks() function initializes a
data_stack object. Principally,
data_stacks are tibbles, where the first column gives
the true outcome in the assessment set, and the remaining
columns give the predictions from each candidate ensemble
member. (When the outcome is numeric, there’s only one column per candidate
member. For classification, there are as many columns per candidate
member as there are levels in the outcome variable minus 1.) They also bring
along a few extra attributes to keep track of model definitions, resamples,
and training data.
?stacks_description for more discussion of the package, generally,
basics vignette for a detailed walk-through of functionality.
Additional arguments. Currently ignored.
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