is an endogenous variable endogenous a perfect linear combination of two variables is a are variables endogenous or exogenous is $x endogenous or exogenous which variable is endogenous is $x a linear combination? is the perfect linear combination of exogenous variables endogenous or exogenous? which linear combination results in endogenous variables which of the following linear combinations results in an endogenous variable? which statement is correct when assuming that variable is endogenous which is a deterministic equation with the perfect combination of a linear combination of exogenous variables. what is the perfect linear combination of exogenous variables in a model can an exogenous variable be called an endogenous variable what is the perfect linear combination of $x are variables endogenous is it wrong to assume that a perfect fit of exogenous variables is endogenous which variable is endogenous are variables endogenous or exogenous which of the following variables can be directly endogenous? what is the perfect fit of all exogenous variables?