The visual analog scale (VAS) demonstrates comparable validity for perennial allergic rhinitis (PAR) and nonallergic rhinitis ...

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 ...

In 2000, London opened its Millennium pedestrian bridge to the public in a widely celebrated event. The momentous occasion drew large numbers of people, eager to view and experience the bridge first ...

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 ...

The General Nutrition Knowledge Questionnaire (GNKQ) was developed in the 1990s and has been widely used. Since then advances in understanding of associations between diet and disease have led to ...