The stimulus-response model
describes a statistical unit
as making a quantitative response to a quantitative stimulus administered by the researcher. The object of this kind of research is to establish a mathematical function that describes the relation between the stimulus amd the response :
The most common form assumed for such functions is linear, thus we expect to see a relationship like
for linear models has been well developed for more than fifty years and a standard form of analysis called linear regression
has been developed.