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    personality psych)self-selected sample bias = smaller variability?

    Context: online personality survey (BFI) for age 10~65 (http://www.colby.edu/psychology/labs/personality/publications/Soto_et_al_2011.pdf) Measure taken: the authors tried to control for possible self-selection bias in the sample by "by examining the variability of Big Five domains and facets in...
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    HELP: Factor analysis used in personality scale

    I am struggling through this article on a personality measure scale (NEO-PI-R) : http://jenni.uchicago.edu/econ-psych-traits/CostaMcCrae1995.pdf On the article p. 27~8, they seem to be looking for specific variance for each variable, and they apparently do this by deriving specificity...