cement {AICcmodavg}

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)

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.

Source

Burnham, K. P., Anderson, D. R. (2002) Model Selection and Multimodel Inference: a practical information-theoretic approach. Second edition. Springer: New York.

Woods, H., Steinour, H. H., Starke, H. R. (1932) Effect of composition of Portland cement on heat evolved during hardening. Industrial and Engineering Chemistry 24, 1207–1214.

Examples

data(cement)
## maybe str(cement) ; plot(cement) ...