discard_unusable drops observations that cannot be used
with models that convert columns to log scale, and therefore requiere non-negative
and finite observations.
Consider that some of the functions within this package will drop observations when required and it is not requiered to be run before fitting a model.
(Type: data.frame) the dataset to be used.
The columns to be cleaned (e.g.
The function returns the summary of the estimated gravity model as an
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