JSM 2004 - Toronto

Abstract #301040

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Activity Number: 211
Type: Topic Contributed
Date/Time: Tuesday, August 10, 2004 : 10:30 AM to 12:20 PM
Sponsor: Section on Quality and Productivity
Abstract - #301040
Title: Blocking Strategies for Factorial Experiments with Hard-to-change Factors
Author(s): Derek F. Webb*+
Companies: Bemidji State University
Address: HS-342, Box 23, Bemidji, MN, 56601,
Keywords: blocking ; randomization ; G-efficiency ; hard-to-change factor
Abstract:

This paper presents blocking strategies for factorial experiments that contain more than one hard-to-change factor. The strategies are based on an algorithm that generates efficient confounding relations. We present the blocking structures and give some examples that result in small prediction variances, are more cost-effective to run than randomized designs, and have higher G-efficiencies than completely randomized designs. We tabulate confounding relations, blocking structures and G-efficiencies for various factorial designs with more than one hard-to-change factor. We also, through example, discuss the differences between blocking with HTC factors and traditional blocking discussed in most books of experimental design.

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