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College‐level statistics courses emphasize the use of the coefficient of determination, R‐squared, in evaluating a linear regression model: higher R‐squared is better. This often gives students an impression that higher R‐squared implies better predictability since textbooks tend to use sample data to support the theory and students rarely have an opportunity to work on real data. In this paper, health care stocks are used as predictors and the result demonstrates that high R‐squared does not necessarily mean high predictability and that multiple linear regression can be used in the study of data behavior. In particular, by learning the pattern of the near and far out‐of‐sample‐prediction errors for different time periods throughout a dataset, the near out‐of‐sample prediction errors can be used to control the prediction errors and identify a subset of predictors that can well reflect the trend of S&P 500.


File nameDate UploadedVisibilityFile size
19 Jul 2022
805 kB



  • Institution
    • Gainesville

  • Publisher
    • the Teaching Statistics: An International Journal for Teachers

  • Date submitted

    19 July 2022

  • Additional information
    • Book or Journal Information:

      the Teaching Statistics: An International Journal for Teachers,