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A study on the relationship between damage of R. solani and free-living nematodes
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Statistics.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Researchers at the Swedish University of Agricultural Sciences wanted to test if thereexists a relationship between damage by R. solani and free-living nematodes by investigatingthe dry weight of various plant parts from potato crops in relation to various treatments.In this thesis we analysed data from the first of a series of experiments to try to identifya interaction effect between free-living nematodes and the pathogenic fungus R. solani.Due to violations of assumptions, the standard analysis of variance model could not beused, instead we resorted to the unequal variance model which offers an intuitive methodof dealing with heteroscedasticity in the multiple comparison case. From the analysis thereis evidence that R. solani has the most severe impact on dry weight, while nematodes havemostly insignificant effects. Due to a problematic experimental design, the analysis proveddifficult, and no conclusion regarding the interaction could be reached.

Place, publisher, year, edition, pages
2014. , 78 p.
Keyword [en]
Heteroscedasticity, Analysis of variance, Randomized complete block design, Incomplete design.
National Category
Probability Theory and Statistics
URN: urn:nbn:se:uu:diva-225897OAI: oai:DiVA.org:uu-225897DiVA: diva2:722660
External cooperation
Sveriges Lantbruksuniversitet
Subject / course
Educational program
Master Programme in Statistics
Available from: 2014-06-24 Created: 2014-06-09 Last updated: 2014-06-24Bibliographically approved

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Kardell, Jonas
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