Abstract
To establish the basis of physical therapy, many reports investigating the reliability of physical therapy assessment methods have been published in recent years. Among the methods for investigating reliability, there are those utilizing relative reliability and those utilizing absolute reliability. The majority of investigations of reliability of physical therapy assessments have been the former, however, in the case of assessment methods for clinical applications, the latter would provide comparatively better information. In this paper, after a summary of types of error, I explain Bland-Altmann analysis, which is an investigation method for absolute reliability, as well as minimal detectable change.
