Woolen thread experiment data set.

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This data frame with 27 observations contains the following columns:

- x1
numeric. Length of test specimens factor.

- x2
numeric. Amplitude of loading cycle factor.

- x3
numeric. Load factor.

- y
numeric. Cycles to failure response.

Box, G. E. P. and D. R. Cox (1964).
"An Analysis of Transformations (with discussion)",
*Journal of the Royal Statistical Society*,
Series B, Vol. 26, No. 2, pp. 211–254.

Box G. E. P, Hunter, J. S. and Hunter, W. C. (2005).
*Statistics for Experimenters II*. New York: Wiley.

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