composite data frame has 16 rows and 4 columns.
Four materials were fed into a wear testing machine
and the amount of wear recorded. Four samples could be processed
at the same time and the position of these samples may be important.
A Latin square design was used.
This data frame contains the following columns:
The run number 1-4
The position number 1-4
The material A-D
The wear measured loss of weight in 0.1mm over testing period
The Design and Analysis of Industrial Experiments by O. Davies, 1954, published by Wiley
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