One-Way Designs with Quantitative Factors

  • Harold R. Lindman
Part of the Springer Texts in Statistics book series (STS)


In some designs, meaningful numerical values can be assigned to the factor levels. An example of this might be a study of extinction (i.e., “unlearning”) of a learned response after 10, 20, 30, 40, 50, and 60 learning trials. The six numbers of learning trials are the six levels of the factor being studied; the data are the numbers of trials to extinction. The labels on the factor levels in this experiment are meaningful numerical values: Thirty trials are 20 more than 10, 60 are 40 more than 20, and so on. If the cell means from such an experiment were plotted in a graph, they might look like those in Figure 10.1 (taken from the data in Table 10.1); in this graph the numerical values of the factor levels dictate both their order and their spacing along the X axis. By contrast, for the data plotted in Figure 3.1, both the ordering and the spacing of the factor levels were arbitrary.


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Copyright information

© Springer-Verlag New York, Inc. 1992

Authors and Affiliations

  • Harold R. Lindman
    • 1
  1. 1.Department of PsychologyIndiana UniversityBloomingtonUSA

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