prepare_model_components: Prepare model-components
In strongio/keanu: Enter the model.matrix

Prepare model-components

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prepare_model_components(forms, data, predvars = NULL,
  standardize_x = FALSE, na.action = na.warn, contrasts = NULL,
  xlev = NULL, drop.unused.levels = FALSE)

`forms`	A list of formulas.
`data`	A data.frame
`predvars`	The 'predvars' attribute of the terms object, from a previous call to this function.
`standardize_x`	Either a logical specifying whether to center/scale numeric predictors in the model.frame, or a list with names 'center' and 'scale', each of which in turn are named numeric vectors specifying centering/scaling. Defaults
`na.action`	A function specifying what to do with NAs. Defaults to `na.warn`.
`contrasts`	Passed to `model.matrix`.
`xlev`	Passed to `model.frame`.
`drop.unused.levels`	Passed to `model.frame`.