Econometrics

  1. Model Specification and Functional Forms
    1. Linear vs. Nonlinear Models
      1. Linear in Variables
        1. Linear in Parameters
          1. Intrinsically Linear Models
          2. Logarithmic Transformations
            1. Log-Level Models
              1. Interpretation of Coefficients
                1. Semi-elasticity
                2. Level-Log Models
                  1. Interpretation of Coefficients
                  2. Log-Log Models
                    1. Elasticity Interpretation
                      1. Constant Elasticity Models
                    2. Polynomial Models
                      1. Quadratic Models
                        1. Higher Order Polynomials
                          1. Interpretation of Coefficients
                            1. Turning Points
                            2. Interaction Terms
                              1. Quantitative Variable Interactions
                                1. Qualitative-Quantitative Interactions
                                  1. Interpretation of Interaction Effects
                                    1. Testing for Interactions
                                    2. Piecewise Linear Models
                                      1. Threshold Models
                                        1. Spline Functions
                                          1. Structural Breaks

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                                        4. The Multiple Linear Regression Model

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                                        6. Qualitative Information and Dummy Variables