Formula objects or strings representing formulas or their right hand sides.
If TRUE then return formula as a string, otherwise as a formula object.
The first formula/string argument should be either the name of the dependent variable or a formula object or string representation of a formula containing a dependent variable (and a ~). This will be used as the dependent variable of the result. The independent variables of the returned result will consist the intersection of all independent variables in the function arguments.
A formula object or a string representing a formula object.
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