Alternative analytic methods may help resolve the dimensionality of personality and the content of those dimensions. Here we tested the structure of personality using spectral clustering and conventional factor analysis. Study 1 analysed responses from 20,993 subjects taking the 300-item IPIP NEO personality questionnaire. For factor analysis, a five-factor solution recovered the FFM domains while the six-factor solution yielded only a small and hard to interpret sixth factor. By contrast, spectral clustering analysis yielded six-cluster solutions congruent with the HEXACO model. Study 2 analysed data from 1,128 subjects taking the 100-item HEXACO-PI-R. Unambiguous support was found for a six-cluster solution. The psychological content of the 6 clusters and their relationship to the FFM domains is discussed.
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