doBy (version 4.6-2)

data-haldCement: 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

# NOT RUN {
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...

# }