The importance of addressing heteroscedasticity in the reliability analysis of ratio‐scaled variables: an example based on walking energy‐cost measurements

Abstract

Variability of gross energy cost, gross non-energy cost, and net energy cost, assessed across different GMFCS levels in children with CP, was proportional to the mean, indicating the presence of heteroscedasticity. This finding emphasizes the importance of always performing a heteroscedasticity examination in reliability studies on energy cost and reporting the reliability statistics accordingly.