A straight line used as a best approximation of a summary of all the points in a scattergram.
Statistically accepted ways of assessing the strength of a particular finding across a number of different studies.
Research which takes measures from the same participants at two or more different times in order to specify the time relationships between variables. This may extend over many years or over a participant’s whole lifetime.
An experimental design in which the researcher studies several behaviours at a time.
Research which allows researchers to observe the effects on behaviour of a naturally occurring ‘manipulation’ (such as an earthquake).
The frequency of a disorder within a lifetime.
Research which uses the non-random assignment of participants to groups in an experiment.
A hypothetical description of a process or mechanism (such as a process or psychological mechanism involved in psychopathology).