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Multiple Regression

Use of Quadratic Terms in Regression Models. One useful form of linear regression is the quadratic regression modelAssume that we have n observations of x and yThe quadratic regression model relating y to x is y = b0 b1x b2x2 eWhere b0 b1x b2x2 is the mean value of the dependent vari

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Multiple Regression

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    1. Multiple Regression 12.8 Quadratic Terms in Regression Models 12.9 Modelling Interaction (Moderator Variables) 12.12 Model Building and Effects of Multicollinearity

    2. Use of Quadratic Terms in Regression Models One useful form of linear regression is the quadratic regression model Assume that we have n observations of x and y The quadratic regression model relating y to x is y = b0 + b1x + b2x2 + e Where b0 + b1x + b2x2 is the mean value of the dependent variable y when the value of the independent variable is x b0, b1, and b2 are unknown regression parameters relating the mean value of y to x e is an error term that describes the effects on y of all factors other than x and x2

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