Gender differences at the item-level in the SAPA data. http://www.personality-project.org/revelle/publications/sapa.mpa.key.pdf …pic.twitter.com/uOzNBmvjFh
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This question makes little sense tome. Look into self vs. other ratings. http://www.ncbi.nlm.nih.gov/pubmed/21038940
It's a no-brainer that single items are not so reliable, i.e. random measurement error. https://en.wikipedia.org/wiki/Spearman%E2%80%93Brown_prediction_formula …
And see Hatemi et al 2010 for a BG study that into account random measurement error. http://www.matthewckeller.com/16.Hatemi.et.al.2010.Nuc.fam.ajps.pdf …
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