Assortative mating for mental illness. A Swedish population study. | Great science coming out of SE lately! :) http://jamanetwork.com/journals/jamapsychiatry/fullarticle/2494707 …pic.twitter.com/ZNvnFNhd6o
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That's what the methods assume they are: unobserved (latent) Pearson correlations obstructed by poor measurement. :) http://john-uebersax.com/stat/tetra.htm