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5. Process Improvement
5.2. Introduction
5.2.4. What are the elements of a simple experiment?

Process model

If a response is a (linear) function of a single predictor, then the equation  y= bo + b1x1  describes its behavior. The term bo is the value of the response when the input factor x1 is 0 and b1 is the rate of change of the response with unit change in the input. 

For the multifactor case the equation expands to become: 

             y = bo + b1x1 + b2X2 + b12XIX2 . ..... 

This equation describes a plane (for two variables, a hyperplane for > 2 variables) rather than a straight line. 

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