ABSTRACT
Circular data can arise from different measurement scales like the compass and the clock. Although such data may arise more often in fields like biology and environmental sciences, also in the social and behavioral sciences researchers are occasionally confronted with circular measurements. Examples of circular data representing directions in degrees or radians are, for instance, found in human movement psychology and cognitive psychology. Examples are studies using a moving room experiment [36], experiments on bimanual coordination [23], and studies on spatial cognition and learning [28]. The outcome of interest in such studies often is an angular deviation, that is, the observed response is compared to the correct response. The first illustration in this chapter uses data of the study by Bullens et al. [5] which is also an example from the field of spatial cognition.
