Describing Structure

Which test / procedures? How do we decide?

July 2, 2017

With so many statistical procedures available, how do we decide which tests are best to address our research objectives? (several posts deal with this topic).   First and foremost, the decision as to which statistical procedures to apply to the data should be made BEFORE the design of the data collection instrument (e.g. the questionnaire), and not AFTER data has been collected. Plan ahead so that your analysis are entirely focused on addressing your research objectives and NOT to address your data.  Too many researchers remain guilty of waiting to see the data so they can decide what to [READ MORE]

Which Test: Factor Analysis (FA, EFA, PCA, CFA)

April 4, 2017

Confused about when to use FA, EFA, PCA, or CFA? Well, all of them are interdependence methods in which no single variable or group of variables are defined as being independent or dependent. The statistical procedure involves the analysis of all variables in the data set simultaneously so the goal of these interdependence procedures is to uncover structure by grouping of variables (as in factor analysis) rather than respondents (typically in cluster analysis) or objects (typically in perceptual mapping). So interdependence methods do not attempt to predict one or more variable by others as [READ MORE]