fit the model subject to linear equality constraints
The constraints are of the form R params = q where R is the constraint_matrix and q is the vector of constraint_values.
The estimation creates a new model with transformed design matrix, exog, and converts the results back to the original parameterization.
Parameters: | constraints : formula expression or tuple
start_params : None or array_like
**fit_kwds : keyword arguments
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Returns: | results : Results instance |