We have looked at how to solve equations with one unknown value, but what happens when there are two unknown values? An equation with two unknown values will have infinitely many solutions.

An equation is a mathematical statement showing that two expressions are equal. The two expressions are linked with an equals symbol (=). The unknown variable (often the letter \(x\)) can take any ...

In this case the efficiency of the estimation may be improved by taking these cross-equation correlations into account. Seemingly unrelated regression (SUR), also called joint generalized least ...