Factor analysis is commonly used in the fields of psychology and education6 and is considered the method of choice for interpreting self-reporting questionnaires.7 Factor analysis is a multivariate statistical procedure that has many uses,8-11 three of which will be briefly noted here. Firstly, factor analysis reduces a large number of variables into a smaller
set of variables (also referred to as factors). Secondly, it establishes underlying dimensions between measured variables and latent constructs, thereby allowing the formation and refinement of theory. Thirdly, it provides construct validity evidence of self-reporting scales.
Nunnally (1978), cited by Thompson11, p.5 adds,