F-statistic can be evaluated for its statistical significance. Nonlinear and Multiple Regressions Nonlinear regressions Relationship may not be linear so OLS is inappropriate. Multiple regression Economic relationships are always multivariate. Use multiple regression techniques to include all relevant variables. Regression analysis on data collected from markets must be adjusted to account for the simultaneity of market equilibrium.
Market observations the result of the interaction of supply and demand.
Estimation of a demand function must overcome the Identification Problem Identification Problem Market observations themselves do not indicate whether they are the result of changes in supply, demand constant changes in demand, supply constant changes in both supply and demand. More advanced regression techniques are required.