Abstract
The slope bias when the predictor variable suffers from measurement errors is investigated. The presence of measurement errors can undermine the least squares linear regression parameter estimates, which in turn will have consequences if slopebased meaningful functions are calculated and used. Methods to determine suitable regression model choice are outlined. Also, the consequences of data size shrinkage due to scaling by metabolic weight in energy balance studies are illustrated. A problem arises when the assumed value of the metabolic index (b) changes. In the literature, this index varies from 0.62 to 0.75 for calculation of metabolic weight (MW) from live weight (LW) i.e. MW=LWb. The estimates of regression parameters vary according to the assumed value of the metabolic index b and that will impact further on intercept and slope based calculations. Similar problems occur when allometry functions are linearized using logarithmic transformation. Disproportional shrinkage of data size introduces scale bias which can introduce inaccuracies in further use of the regression parameters. Both of these issues have potential difficulties when using databases where data size is unevenly distributed
Original language  English 

Pages (fromto)  110 
Number of pages  10 
Journal  eplanet 
Volume  14 
Issue number  1 
Publication status  Published  10 Jun 2016 
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Ruth Sanderson
 Faculty of Earth and Life Sciences, Institute of Biological, Environmental & Rural Sciences (IBERS)  Statistician
Person: Research