Components and indicators of social vulnerability determine the key areas of investments for disaster reduction and developing resilience in various communities of practice.

Work Package 1.2.3 described and characterized the social vulnerability of residents living in Metro Manila, Iloilo City, and Naga City using Principal Components Analysis (PCA). Through this method, data on multiple socio-economic indicators can be grouped together with other statistically similar indicators to form general components of vulnerability derived from the relationships between the original collection of socio-economic indicators. The data used in the PCA in Metro Manila and Iloilo comes from the Philippine Statistics Authority (PSA) Census on Population and Housing from the years 1990, 2000, 2010, and 2015. The team from Naga City, on the other hand, used data from the city’s Community-Based Monitoring System (CBMS). In Year 3, individual social vulnerability PCA runs for Manila City, Quezon City, and Navotas City were conducted. Throughout all the runs, the PCA yielded a consistently high percentage of variance explained across all cities, indicating that the components extracted were able to represent a large part of the variance in the data. 

These statistical results show that the structure of social vulnerability among the urban  populations are evolving and becoming complex, involving multiple stakeholders. Most  of these dimensions of social vulnerability are hardly considered in local climate  change adaptation and disaster risk reduction (CCA-DRR) programs, nor in the local  governments’ annual investment plans (AIPs). 

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