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Activity Number: 233
Type: Topic Contributed
Date/Time: Monday, August 5, 2013 : 2:00 PM to 3:50 PM
Sponsor: Section on Statistics and the Environment
Abstract - #308385
Title: Properties of Slope Estimators Associated with Random Slope Models
Author(s): Brian Gray and Vyacheslav Lyubchich*+ and Yulia R. Gel
Companies: U.S. Geological Survey and University of Waterloo, Canada and University of Waterloo
Keywords: bias ; multilevel models ; random slope models ; sample size ; water temperature
Abstract:

Regression models where slopes vary randomly among groups have become popular in ecological and other settings. However, these models may yield biased variance estimators when within- and/or among-group sample sizes are small (as will often be the case with ecological and environmental datasets). We address this concern using river temperature and simulated data.


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