Using the Variagraph to Test Lack of Fit of a Parametric Regression Model Without Replication

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Acknowledgments

Research supported in part by the College of Natural Resources, University of Idaho, and in part by the Minnesota Agricultural Experiment Station, University of Minnesota, St. Paul, Minnesota. The authors are grateful to Professors David Larsen and John Kershaw for very useful suggestions, and to the associate editor and two anonymous referees for comments that greatly strengthened the article.