This is a replicated 3^2 experiment reported in Box, Hunter, and Hunter (2005), Table 10.17.
A data frame with 18 observations on the following 3 variables.
a numeric vector, coded design variable for ethanol concentration
a numeric vector, coded design variable for air-to-fuel ratio
a numeric vector, the response (CO concentration, in micrograms per cubic meter)
This example, when fitted with a second-order response surface, is an example of a rising ridge. The dataset is duscussed again one chapter later in the source text; Figure 11.17 of BH^2 suggests the coding formulas used in the example below.
Box, GEP, Hunter, JS, and Hunter, WG (2005) Statistics for Experimenters (2nd ed), Wiley.
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