Description

Cement hardening data from Woods et al (1932).

Usage

Format

Cement is a data frame with 5 variables. x1-x4 are four predictor variables expressed as a percentage of weight.

y

calories of heat evolved per gram of cement after 180 days of hardening

X1

calcium aluminate

X2

tricalcium silicate

X3

tetracalcium alumino ferrite

X4

dicalcium silicate.

Source

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

References

Burnham, K. P. and Anderson, D. R (2002) Model selection and multimodel inference: a practical information-theoretic approach. 2nd ed. New York, Springer-Verlag.