Hardness and a Block Experiment
Four types of tip are used which form the blocks in this experiment. The variable of interest is the hardness which further depends on the type of metal coupon. For each type of the tip, the hardness is observed for 4 different types the metal coupon.
data(hardness)
A data frame with 16 observations on the following 3 variables.
Tip_TypeFour types of tip which form the blocks
Test_CouponFour different types of metal coupons
HardnessHardness of the coupon
Montgomery, D. C. (1976-2012). Design and Analysis of Experiments, 8e. J.Wiley.
data(hardness) hardness$Tip_Type <- as.factor(hardness$Tip_Type) hardness$Test_Coupon <- as.factor(hardness$Test_Coupon) hardness_aov <- aov(Hardness~Tip_Type+Test_Coupon,data=hardness) summary(hardness_aov)
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