Hw5b_solution

# Hw5b_solution - HOMEWORK 5-B SOLUTIONS 1>...

This preview shows pages 1–4. Sign up to view the full content.

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

View Full Document

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: HOMEWORK 5-B SOLUTIONS 1) > cast<-read.csv("castdata.csv",header=TRUE) > plot(cast) Based on the scatterplot matrix, “GateDiam” most affects the variable “BatchTime”. Furthermore, dots in “GateDiam” vs “BatchTime” plot has a nonlinear pattern. Therefore, we conclude that “GateDiam” has a nonlinear relationship with “BatchTime”. 2) > cast.multi<-lm(BatchTime~., data=cast) > cast\$residual <-cast.multi\$residual > plot(cast) > summary(cast.multi) Call: lm(formula = BatchTime ~ ., data = cast) Residuals: Min 1Q Median 3Q Max -230.044 -71.338 -7.585 58.405 391.439 Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 3761.22 395.12 9.519 2.85e-15 *** GateDiam -1039.72 96.54 -10.770 < 2e-16 *** CupHeight -38.53 34.66 -1.112 0.2693 SprueHeight 20.66 24.27 0.851 0.3968 RiserDiam 58.23 25.58 2.276 0.0252 * SprueDiamBot 131.52 110.66 1.189 0.2377 SprueDiamTop 130.74 79.57 1.643 0.1039 RiserHeight 25.22 31.72 0.795 0.4287 Riser1Pos -31.85 35.64 -0.894 0.3739 Riser2Pos -20.28 28.98 -0.700 0.4859 --- Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 Residual standard error: 130.5 on 90 degrees of freedom Multiple R-Squared: 0.5877, Adjusted R-squared: 0.5465 F-statistic: 14.26 on 9 and 90 DF, p-value: 4.936e-14 > extractAIC(cast.multi) [1] 10.0000 983.7433 The AIC value for this model is 983.7433. > plot(cast.multi) 0.00 0.05 0.10 0.15 0.20-2-1 1 2 3 Leverage Standardized residuals lm(BatchTime ~ .) Cook's distance Residuals vs Leverage 77 65 28 3400 3500 3600 3700 3800 3900 4000...
View Full Document

{[ snackBarMessage ]}

### Page1 / 6

Hw5b_solution - HOMEWORK 5-B SOLUTIONS 1>...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online