Model%20Building

Model%20Building - 4/24/11 CHAPTER17 ModelBuilding

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Click to edit Master subtitle style 4/24/11 CHAPTER 17 Model Building
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
 4/24/11 Polynomial Models with One Quantitative  Predictor Variable Simple linear regression equation: Equation for second-order polynomial model: Equation for third-order polynomial model: Equation for general polynomial model: x b b y 1 0 ˆ + = 2 2 1 0 ˆ x b x b b y + + = 3 3 2 2 1 0 ˆ x b x b x b b y + + + = p p x b x b x b x b b y + + + + + = ... ˆ 3 3 2 2 1 0
Background image of page 2
 4/24/11 Example with One Quantitative Predictor  Problem 17.8:  International Data Corporation has reported the  following costs per gigabyte of hard drive storage space for years 1995  through 2000. Using  = 1 through 6 to represent years 1995 through  2000, fit a second-order polynomial model to the data and estimate the  cost per gigabyte for the year 2008.    The regression equation     will have the form: Year x  = Yr = Cost 1995 1 $261.84 1996 2 137.94 1997 3 69.68 1998 4 29.30 1999 5 13.09 2000 6 6.46 2 2 1 0 ˆ x b x b b y + + =
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example, Problem 17.8, cont. Using Excel Output SUMMARY OUTPUT Regression Statistics Multiple R 0.99655892 R Square 0.99312969 Adjusted R Square 0.98854948 Standard Error 10.5650522 Observations 6 ANOVA df SS MS F Significance F Regression 2 48405.43097 24202.7155 216.830715 0.00056946 Residual 3 334.8609836 111.620328 Total 5 48740.29195 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept 387.993 18.89933991 20.5294472 0.00025272 327.846809 448.139191 yearcode -147.65675 12.3644646 -11.9420254 0.00126294 -187.006032 -108.307468
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 15

Model%20Building - 4/24/11 CHAPTER17 ModelBuilding

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online