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Grab something from an object
grab(from, what, ...)
the value returns depends on the argument what.
what
an object
what to grab one of 'response', 'design_matrix', 'response_formula', 'fixed_formula', 'eeFUN'
additional arguments passed to grab_** function
grab_**
grab_response, grab_design_matrix, grab_response_formula, grab_fixed_formula, grab_design_levels
grab_response
grab_design_matrix
grab_response_formula
grab_fixed_formula
grab_design_levels