Table 1. Evaluation of the number of principal components to retain for factor analysis of 18 social vulnerability indicators using eight commonly used evaluation techniques.

Method	Principal Components Retained	References
Kaiser—Guttman [KG]	6	[36]
Jolliffe’s KG	8	[37]
Scree Plot	4 or 9	[34, 38]
Broken Stick	4	[34, 39, 40]
Parallel Analysis	4	[41–44]
80% Variance Explained	8
90% of Variance Explained	12
Information Dimension	11.9	[35]
Mean	7.43