Typical FA Results Illustrated with an Extended Example

4 Typical FA Results Illustrated with an Extended Example 

Again we use the extended example first analyzed by cluster analysis in Section 5.3.5. 

Remember that one can test the significance of all the correlation coefficients by comparison with one critical value (see Section 2.4.2, example). The significant correlations at a risk of an error of the first kind of 5% are printed in bold in Tab. 5-3. 

Multiplying by the square roots of the respective eigenvalues gives the loadings listed in Tab. 5-6. If we concentrate on features which contribute to the factors by more than 

where the squared coefficients exceed approximately 0.7, we may interpret the first factor as determined mainly by the elements Si, Al, Fe, and Ti. We note that most of the elements found in the second cluster (see also Section 5.3.5) load this factor. Na and Mg dominate the following two factors. The importance of the element Ca is spread over the first three factors. 

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