The variagraph is a graphical diagnostic technique for assessing lack of fit and estimating pure error without replication for regression modelling. The behavior of the variagraph is explored by simulation, and its use demonstrated on an example dataset previously applied in lack-of-fit testing.
Research supported by the College of Natural Resources and Agricultural Experiment Station, University of Minnesota, St. Paul, MN, and the McIntire-Stennis Cooperative Forest Research Program. Published as paper no. 964420004 of the Minnesota Agricultural Experiment Station.
Robinson, Andrew P.; Weisberg, Sanford.
The variagraph concept and a lack-of-fit test..
University of Minnesota.
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