Testing instruments with factor analyses and Cronbach's alpha
Measuring in science means providing valid and reliable data.
One way to get valid and reliable data is to create a questionnaire with a list of statements about a topic. In questionnaires, respondents are asked to give their answer on a five-point Likert scale. The list of statements is supposed to measure a construct. To statistically test whether the construct has been measured correctly, a form of factor analysis is performed. And to test whether the construct has been reliably measured, Cronbach's alpha must be calculated.
This, in a nutshell, is the essence of why factor analysis should be applied and Cronbach's alpha should be calculated. Much more details can be found in our paper.
I wish you the best of luck with your research.
Foeke van der Zee
Author of this paper/manual
Our clarifying manuals Courses