2010), since the rarer a variant is the less it can possibly be correlated with a common SNP in a sample of unrelated people (Wray 2005; Wray et al. 2011)1. To test (b), we examine the association between personality traits and the level of inbreeding in the ancestry of each individual as indexed by the extent to which their genome is in `runs of homozygosity' (i.e. homozygous stretches of DNA that can be observed in the offspring of even distant relatives (Keller et al. 2011b)).
