A proposed method to investigate reliability throughout a questionnaire.

The article presents a research paper which proposes a new method for evaluating reliability throughout a questionnaire by screening of systematic change in random error. Questionnaires are commonly used for medical and health care research. The paper refers to a simulation study which explores whether systematic change in reliability could be evaluated with the help of unsupervised classification of subjects by cluster analysis (CA) and estimation of intraclass correlation coefficient (ICC).