Is there any indication that a transformation is required

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Reconsider the photoresist experiment in Problem 8.26. Use the variance of the resist thickness at each test combination as the response variable. Is there any indication that a transformation is required?

Problem 8.26

Nonregular fractions of the 2k [John (1971)] Consider a 24 design. We must estimate the four main effects and the six two-factor interactions, but the full 24 factorial cannot be run. The largest possible block size contains 12 runs. These 12 runs can be obtained from the four one-quarter replicates defined by I = ± AB = ± ACD = ± BCD by omitting the principal fraction. Show how the remaining three 24 - 2 fractions can be combined to estimate the required effects, assuming three-factor and higher interactions are negligible. This design could be thought of as a three-quarter fraction.

Reference no: EM131082662

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