+--------+-------------------+
| Wool   | R Documentation   |
+--------+-------------------+

Wool data
---------

Description
~~~~~~~~~~~

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.

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, 211-46.

References
~~~~~~~~~~

Fox, J. and Weisberg, S. (2011) *An R Companion to Applied Regression*,
Second Edition, Sage.

Weisberg, S. (2005) *Applied Linear Regression*, Third Edition. Wiley,
Section 6.3.
