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What affects the tear strength of paperboard?: Consequences of unbalance in a designed experiment
Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This essay covers a designed experiment on paperboard where the quality under study is tear strength alongside and across.

The objective is to examine what consequences the loss of balance in a designed experiment has on the explanatory power of the proposed empirical model. As did happen, the trial plan didn’t go as planned when the first run caused a disruption of the paperboard in the machine. Decision from the company was to raise the low level of one of the design factors to prevent this from happening again. The consequence of this is an alteration of the design during ongoing experimentation. This in turn affects what analysis approaches are appropriate for the problem.

Three different approaches for analyzing the data are presented, each with different propositions on how to deal with the complication that occurred. The answer to the research question is that the ability of the empirical model to discover significant effects is moderately weakened by the loss of one run (out of eight total). The price payed for retrieving less information from the experiment is that the empirical model, for tear strength across, doesn’t deem the effects significant at the same level as for the candidate model with eight runs. Instead of concluding that the main effect of  and the interaction effect  is significant at the 2%- and 4%-level, respectively, we must now settle with deeming them significant at the 6%- and 7%-level. 

Place, publisher, year, edition, pages
2017. , p. 29
Keyword [en]
Designed experiment, paperboard, statistical analysis, ANOVA, regression, unbalanced design, tear strength
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:kau:diva-63985OAI: oai:DiVA.org:kau-63985DiVA, id: diva2:1144552
External cooperation
Stora Enso
Subject / course
Statistics
Supervisors
Examiners
Available from: 2017-10-16 Created: 2017-09-26 Last updated: 2017-10-16Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • de-DE
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  • en-US
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  • nn-NB
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More languages
Output format
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