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- Title
Estimating missing values from negligible interactions in factorial designs.
- Authors
Xampeny, Rafel; Grima, Pere; Tort‐Martorell, Xavier
- Abstract
When a factorial design has some missing value but there are contrasts (at least as many as there are missing values) corresponding to interactions that can be considered negligible, equating the expressions of those contrasts to 0 allows the missing values to be deduced. This procedure allows estimating values that correspond to runs that have gone wrong or could not be performed as planned, as well as to reduce the experimental plan while saving some runs whose results can be estimated a posteriori. The problem is that the estimated values have a variance that is higher than that of the experimental runs, and the variance depends on which are the missing values and the contrasts used to make the estimate. This article performs a thorough analysis of the variances obtained by estimating up to 2 missing values in 8-run designs and up to 5 in 16-run designs, with tables included which provide the missing values and contrasts that should be used to obtain estimates that have minimal variability.
- Subjects
FACTORIAL experiment designs; INDUSTRIAL design; INDUSTRIAL engineering; RELIABILITY in engineering; QUALITY control
- Publication
Quality & Reliability Engineering International, 2017, Vol 33, Issue 6, p1235
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/qre.2172