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If one wants to construct an index using PCA, can he use loadings of the first leading component as weights?

For instance, if there are 6 different variables: debt, export, import, FDI, remittances and foreign aid, and the purpose is to create an index of economic ties of partner countries of country A based on these variables, is it valid to run PCA, obtain loadings of the first leading component and use these loadings as weights for the variables ignoring other principal components.

If it is a valid methodology, please share the valid literature, that does the same.

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