-Formula 1: for discovery EFA factor analysis: based on the study of Hair, Anderson, Tatham and the Black (1998) for reference about the expected sample size. Minimum sample size which is the fivefold of the total observed variation, here's matching sample size for research that uses human factors analysis). Besides (Comrey, 1973; Roger, 2006) also said that the capacity of the observed sample n = 5 * m, the m note is the number of questions in the research.
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