Analysis of robust design experiments with time-dependent ordinal response characteristics : a quality improvement study from the horticulture industry
Parsons, Nicholas R., Gilmour, S. G. and Edmondson, R. N.. (2009) Analysis of robust design experiments with time-dependent ordinal response characteristics : a quality improvement study from the horticulture industry. Journal of Applied Physics, Vol.36 (No.9). pp. 1037-1054. ISSN 0266-4763Full text not available from this repository.
Official URL: http://dx.doi.org/10.1080/02664760802566796
An approach to the analysis of time-dependent ordinal quality score data from robust design experiments is developed and applied to an experiment from commercial horticultural research, using concepts of product robustness and longevity that are familiar to analysts in engineering research. A two-stage analysis is used to develop models describing the effects of a number of experimental treatments on the rate of post-sales product quality decline. The first stage uses a polynomial function on a transformed scale to approximate the quality decline for an individual experimental unit using derived coefficients and the second stage uses a joint mean and dispersion model to investigate the effects of the experimental treatments on these derived coefficients. The approach, developed specifically for an application in horticulture, is exemplified with data from a trial testing ornamental plants that are subjected to a range of treatments during production and home-life. The results of the analysis show how a number of control and noise factors affect the rate of post-production quality decline. Although the model is used to analyse quality data from a trial on ornamental plants, the approach developed is expected to be more generally applicable to a wide range of other complex production systems.
|Item Type:||Journal Article|
|Subjects:||Q Science > QA Mathematics
S Agriculture > SB Plant culture
|Divisions:||Faculty of Medicine > Warwick Medical School > Health Sciences
Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Faculty of Medicine > Warwick Medical School
|Library of Congress Subject Headings (LCSH):||Horticulture, Quality of products -- Mathematical models|
|Journal or Publication Title:||Journal of Applied Physics|
|Number of Pages:||18|
|Page Range:||pp. 1037-1054|
|Access rights to Published version:||Restricted or Subscription Access|
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