Factor Analysis

Question 1

Sample Size & Correlation

Answer 1

• Rule of thumb N*10 per item
• KMO test
• correlation matrix >0.3<0.8 -> Pearson product moment coefficient r

Question 2

Factor extraction

Answer 2

• A priori
• Kaiser Criterion - Eigenvalue > 1
• Scree Plot -> all factors left to the inflection point
• Parallel Analysis -> all factors left to meeting point

Question 3

Factor rotation

Answer 3

Orthogonal -> uncorrelated (Varimax)
=> rotated factor matrix

Oblique -> correlated (Direct Oblimin)
=> pattern matrix

Principle Axis factoring -> excluding error variables

Question 4

Reliability & Validity

Answer 4

R = Cronbach‘s Alpha -> unidirectional as an assumption

V = high convergence (high factor loading) & divergence (low factor loading)