battery {ACSWR}

Two Factorial Experiment for Battery Data

Description

An experiment where the life of a battery is modeled as a function of the extreme variations in temperature of three levels 15, 70, and 1250 Fahrenheit and three type of plate material. Here, the engineer has no control on the temperature variations once the device leaves the factory. Thus, the task of the engineer is to investigate two major problems: (i) The effect of material type and temperature on the life of the device, and (ii) Finding the type of material which has least variation among the varying temperature levels. For each combination of the temperature and material, 4 replications of the life of battery are tested.

Usage

data(battery)

Format

A data frame with 36 observations on the following 3 variables.

Life

battery life

Material

the type of plate material

Temperature

three extreme variations of temperature

Source

Montgomery, D. C. (1976-2012). Design and Analysis of Experiments, 8e. J.Wiley.

Examples

data(battery)
names(battery) <- c("L","M","T")
battery$M <- as.factor(battery$M)
battery$T <- as.factor(battery$T)
battery.aov <- aov(L~M*T,data=battery)
model.matrix(battery.aov)
summary(battery.aov)