How is exploratory factor analysis measured?
Exploratory factor analysis (EFA) is a classical formal measurement model that is used when both observed and latent variables are assumed to be measured at the interval level. Characteristic of EFA is that the observed variables are first standardized (mean of zero and standard deviation of 1).
How does factor analysis show validity?
It then focuses on factor analysis, a statistical method that can be used to collect an important type of validity evidence. Factor analysis helps researchers explore or confirm the relationships between survey items and identify the total number of dimensions represented on the survey.
When to use exploratory or confirmatory factor analysis?
Exploratory factor analysis (EFA) could be described as orderly simplification of interrelated measures. EFA, traditionally, has been used to explore the possible underlying factor structure of a set of observed variables without imposing a preconceived structure on the outcome (Child, 1990).
How do I validate instrument through factor analysis?
Then there is a bandwagon effect and numerous studies use an unproven measure. It is always better to use LISREL or R to check the validity of the measure in your study and to report the validity indicators for your sample (RMSEA, GFI, CFI, chi square). This adds to the confidence with which we can use the measure.
Why are factor analysis methods and validity evidence important?
Instrument development consistent with best practices is necessary for effective assessment and evaluation of learners and programs across the medical education continuum. The author explored the extent to which current factor analytic methods and other techniques for establishing validity are consistent with best practices.
Do you use EFA or CFA to validate an instrument?
If you are using a valid instrument for your study, there is no need to use EFA. Just use CFA to see whether it can also apply to your sample (i.e., to validate an instrument). However, if you add some new items or modify the items to meet the needs of your study, then both EFA and CFA (on a new sample) are required.