Wool  R Documentation 
Wool data
Description
This is a threefactor 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.
Usage
Wool
Format
This data frame contains the following columns:
 len

length of specimen (250, 300, 350 mm)
 amp

amplitude of loading cycle (8, 9, 10 min)
 load

load (40, 45, 50g)
 cycles

number of cycles until failure
Source
Box, G. E. P. and Cox, D. R. (1964). An analysis of transformations (with discussion). J. Royal Statist. Soc., B26, 21146.
References
Fox, J. and Weisberg, S. (2019) An R Companion to Applied Regression, Third Edition, Sage.
Weisberg, S. (2014) Applied Linear Regression, Fourth Edition, Wiley, Section 6.3.