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Table 1 Factor Retention and Composition Criteria

From: Assessing exposure to war-related traumatic events in older Vietnamese war survivors

  Step Purpose Criteria
Factor (F) Retention
 Eigenvalue 2 Variance explained by F ≥ 1.0
 Scree Test 2 F Strength/relevance Elbow location [52]
 Parallel Test 2 F Strength/relevance Line intersection
 Factor Correlation 2–3 F Distinctiveness <  0.85 [44, 53]
Factor Composition
 Correlation 1 Sufficient association ≥ 0.3 [50]
 Loadings 2–3 Item determinacy ≥ 0.41 [50]
 Crossloading 2–3 Item distinctiveness Diff. >  0.5 [46, 50, 51]
 # Items per factor 2–3 Model identification >  2 [44, 50, 51]
 Uniqueness 2–3 Proportion unexplained by F ≤ 0.6 [44, 50]
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