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AICcmodavg (version 2.3-2)

cement: Heat Expended Following Hardening of Portland Cement

Description

This data set illustrates the heat expended (calories) from mixtures of four different ingredients of Portland cement expressed as a percentage by weight.

Usage

data(cement)

Arguments

Format

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

x1

calcium aluminate.

x2

tricalcium silicate.

x3

tetracalcium alumino ferrite.

x4

dicalcium silicate.

y

calories of heat per gram of cement following 180 days of hardening.

Details

Burnham and Anderson (2002, p. 101) use this data set originally from Woods et al. (1932) to select among a set of multiple regression models.

Examples

Run this code
data(cement)
## maybe str(cement) ; plot(cement) ...

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