Abstract

SAHAGUN-CASTELLANOS, J.; MARTINEZ-GARZA, A.  and  RODRIGUEZ-PEREZ, J. E.. Common problems and methods of the analysis of factorial experiments. Rev. Chapingo Ser.Hortic [online]. 2008, vol.14, n.2, pp.213-222. ISSN 2007-4034.

Factorial experiments are frequently carried out in agronomic research. These are tools that make an optimus resources use; produce more precise estimates of treatment means constrasts, and make possible the interactions among factors study. The full release of these advantages, however, is not always obtained due to one or several of the following common problems: interaction concept poor interpretation; multiple comparison procedures abuse; regression techniques sub utilization or omission, orthogonal contrasts and polynomials, etc. In order to contribute to solve these problems and thereby to improve the scientific articles to be published quality, in this paper several interaction concept meanings, including from its etymological aspects until its analysis of variance variation source meaning , were analyzed. In addition, cases related with the pertinence, use and advantages of regression, contrasts, and orthogonal contrast and polynomial techniques were analyzed in the factorial experiments context. Factorial experiments hypothetical cases were considered to make a more objective presentation. It is hoped that the reader's conceptual perception and capacity to successfully associate cases of factorial experiments and statistical methods to analyze them properly will be improved and thereby will enable them to increase the results interpretation and their scientific publications quality.

Keywords : factorial experiments; interaction; contrasts; orthogonal contrasts; multiple comparisons.

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