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Notes: Rounding Effects in Simple Linear Regression

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In simple linear regressions relating tree diameters at the beginning and end of 15- and 20-year periods, an increase in the measurement interval for the independent variable from tenths of inches to whole inches caused an 8.7-percent negative bias in the estimated slope, an average loss of 6.2 percent in r², and an increase in mean squared residuals of 29.2 percent. Bias and loss in precision occurred in both large and small samples. Accuracy of measurement of independent variables should be consistent for data used to derive a regression and for new data to which the regression equation is to be applied. Forest Sci. 16:301-303.

Keywords: Measurements; diameter growth

Document Type: News

Affiliations: Biometrician, Weyerhaeuser Research Center, Centralia, Wash.

Publication date: September 1, 1970

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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