Create your free account Teacher Student. Least square method can be used to find out the Quadratic Regression Equation. For example the expected happiness level of someone who works 30 hours per week is.
That is we need to find the values of a b and c such that the squared vertical distance between each point x i y i and the quadratic curve y a x 2 b x c is minimal.
In this lesson you will learn how to write a quadratic equation by finding a pattern in a table. Quadratic Regression Equationy a b x c x2 c S x 2 y S xx - S xy S xx 2 S xx S x 2 x 2 - S xx 2 2 b S xy S x 2 x 2 - S x 2 y S xx 2 S xx S x 2 x 2 - S xx 2 2 a S y n - b S x n - a S x 2 n Where. In this method we find out the value of a b and c so that squared vertical distance between each given point x i y i and the parabola equation y a x 2 b x 2 is minimal. All fields are required.