This is a three-factor experiment with each factor at three levels, for a total of 27 runs. Samples of worsted yarn were with different levels of the three factors were given a cyclic load until the sample failed. The goal is to understand how cycles to failure depends on the factors.
This data frame contains the following columns:
length of specimen (250, 300, 350 mm)
amplitude of loading cycle (8, 9, 10 min)
load (40, 45, 50g)
number of cycles until failure
Box, G. E. P. and Cox, D. R. (1964). An analysis of transformations (with discussion). J. Royal Statist. Soc., B26, 211-46.
Weisberg, S. (2005). Applied Linear Regression, 3rd edition. New York: Wiley, Section 6.3.