The data are from the first 8 rows of the pollutant water treatment example in the book by Box, Hunter and Hunter, 2nd edition, Chapter 5, Question 19.
The data are in coded units where: C: -1 is chemical brand A; +1 is chemical brand B T: -1 is 72F for treatment temperature; +1 is 100F for the temperature S: -1 is No stirring; +1 is with fast stirring y: is the pollutant amount in the discharge [lb/day].
The aim is to find treatment conditions that MINIMIZE the amount of pollutant discharged each day, where the limit is 10 lb/day.
A data.frame containing 8 observations of 4 variables (C, S, T and y)
Box, Hunter and Hunter, 2nd edition, Chapter 5, Question 19, page 232.
Box, G. E. P. and Hunter, J. S. and Hunter, W. G., 2005, Statistics for Experimenters, Second edition. Wiley.
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