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.
# Create a coded dataset based on info in BH^2 Fig 11.17 CO <- as.coded.data(codata, x1 ~ (Ethanol - 0.2)/0.1, x2 ~ A.F.ratio - 15) names(CO) <- "CO.conc"
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.