1. 因子分析

2. History Early 20th-century attempt to define and measure intelligence
Developed primarily by scientists interested in psychometrics
Advent of computers generated a renewed interest
Each application must be examined on its own merits

3. Essence of Factor Analysis
Describe the covariance among many variables in terms of a few underlying, but unobservable, random factors.
A group of variables highly correlated among themselves, but having relatively small correlations with variables in different groups represent a single underlying factor

4. Examination Scores

5. Orthogonal Factor Model

6. Orthogonal Factor Model

7. Orthogonal Factor Model

8. Orthogonal Factor Model

9. Orthogonal Factor Model

10. 正交变换（因子旋转）

11. Principal Component Solution

12. Principal Component Solution

13. Residual Matrix

14. Determination of Number of Common Factors

15. Examination Scores（因子旋转）

16. Maximum Likelihood Solution

17. Factor Rotation

18. Rotated Factor Loading