R: Heat development in cement under hardening.

haldCement {doBy} | R Documentation

## Heat development in cement under hardening.

### Description

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

### Usage

    data(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...

[Package doBy version 4.5-15 Index]