tailieunhanh - Business process improvement_2

Tham khảo tài liệu 'business process improvement_2', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Are the model residuals well-behaved Sample residuals versus fitted values plot showing increasing residuals Predicted Values Figure Sample residuals versus fitted values plot that does not show increasing residuals http div898 handbook pri section2 6 of 10 5 1 2006 10 30 22 AM . Are the model residuals well-behaved Figure Interpretation A residual distribution such as that in Figure showing a trend to higher absolute residuals as of the the value of the response increases suggests that one should transform the response perhaps by residuals modeling its logarithm or square root etc. contractive transformations . Transforming a versus fitted response in this fashion often simplifies its relationship with a predictor variable and leads to values plots simpler models. Later sections discuss transformation in more detail. Figure plots the residuals after a transformation on the response variable was used to reduce the scatter. Notice the difference in scales on the vertical axes. Independence of Residuals from Factor Settings Sample residuals versus factor setting plot http div898 handbook pri section2 7 of 10 5 1 2006 10 30 22 AM . Are the model residuals well-behaved Sample residuals versus factor setting plot after adding a quadratic term Factor Level Figure http div898 handbook pri section2 8 of 10 5 1 2006 10 30 22 AM