In my previous blog post, I noted that reliability and validity are two essential properties of psychological measurement. Measures of intelligence, personality, vocational interests, and so forth ...

There is a distinction that one learns about on the first day of a course in psychological research methods. It is the difference between internal and external validity. Internal validity is ...

1 NSW Centre for the Advancement of Adolescent Health, Department of Paediatrics and Child Health, University of Sydney at The Children's Hospital at Westmead, New South Wales, Australia 2 Physical ...

Correspondence to Dr Moritz Schumann, Institute of Cardiovascular Research and Sports Medicine, Department of Molecular and Cellular Sports Medicine, German Sport University Cologne, Koln 50858, ...