discard_unusable: Discard non-positive and/or non-finite observations in datasets
Description
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.
Usage
discard_unusable(data, columns)
Value
The function returns the summary of the estimated gravity model as an
lm-object.
Arguments
data
(Type: data.frame) the dataset to be used.
columns
The columns to be cleaned (e.g. c("flow", "distw")) in
the case of ddm when used with the example dataset gravity_zeros)