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Home  >  Volume 22 (2012)

Design of Experiments (DOE): Recent Advances and Development by Poly. E. Chigbu. Volume 22 (November, 2012), pp 233 – 240
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Abstract

The role of Design of Experiment (DoE) or Experimental Design in researches in all disciplines is very significant, since its applicability ensures reliability of findings in any study. Design of experiment is concerned with planning experiments with specific objectives in order to obtain maximum amount of information from available resources. In the area of DoE, two phases are usually involved: design and analysis phases. Simplicity and efficiency are required of every experimental design, which are achievable by adhering to these three basic and pertinent principles of experimental design: replication, randomization and blocking. An experimental design is specified by describing exactly the method of randomly assigning (randomizing) the treatments of treatment structure to the experimental units of the block structure. Recent advances have shown that randomization in experimental design is not only the process of randomly assigning treatments to experimental units of the block structure by means of random process, but also that of ensuring that the validity of the conclusions drawn from experiment are free from the biases of the experimenter. This is achieved by introducing the notion of Hinkelmann and Kempthorne (2008) called design-random variables which are used to obtain a derived linear model (randomization model). Randomization model is a model that does not require any assumption concerning the form of the response being a function of the values of the factors influencing it as it is the case of the normal model, where the assumption of normality of the response variable is made evident.

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