haldCement: Heat development in cement under hardening.

In doBy: Groupwise Statistics, LSmeans, Linear Estimates, Utilities

Heat development in cement under hardening.

Description

Heat development in cement under hardening related to the chemical composition.

Usage

haldCement

Format

A data frame with 13 observations on the following 5 variables.

x1

Percentage (weight) of ⁠[3Ca0][Al2O3]⁠

x2

Percentage (weight) of ⁠[3Cao][SiO2]⁠

x3

Percentage (weight) of ⁠[4Ca0][Al2O3][Fe03]⁠

x4

Percentage (weight) of ⁠[2Cao][SiO2]⁠

y

Heat development measured in calories per gram cement after 180 days

References

Anders Hald (1949); Statistiske Metoder; Akademisk Forlag (in Danish), page 509.

Examples

data(haldCement)

if( interactive() ){
pairs( haldCement )
}
m <- lm(y ~ x1 + x2 + x3 + x4, data=haldCement)
summary(m)

# Notice: The model explains practically all variation in data;
# yet none of the explanatory variables appear to be statistically
# significant.

doBy documentation built on Oct. 8, 2024, 1:06 a.m.