Experiment on the heat evolved in the setting of each of 13 cements.
Thirteen samples of Portland cement were set. For each sample, the percentages of the four main chemical ingredients was accurately measured. While the cement was setting the amount of heat evolved was also measured.
x1, x2, x3, x4
- Proportions (%) of active ingredients.
- heat evolved in cals/gm.
Hald, A. (1957) Statistical Theory with Engineering Applications. Wiley, New York.
lm(y ~ x1 + x2 + x3 + x4, cement)