For the test including 9 middle items, the variation in test scores (high in controls, low in cases) thus matches the genetic variation (high in controls, low in cases).
Of the subscales, the scale including 9 middle items always performs best in the context of GWAS because the variation in test scores on this scale 'matches' the expected genetic variation.
Specifically, cases (i.e., individuals with high latent trait scores), will endorse (almost) all middle items, such that the variation in their test scores is low.
Place any candy or item in the middle of the tissue paper.
To be perfectly clear, you want to have three things stacked on your work surface: on the bottom, your scorched item, in the middle, your peroxide rag, and on top, your dry rag.
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An antique roll-top bath sits in the middle of his office - only one item in a fine selection of Victorian sanitary ware.
Center the tall items in the middle of the basket.
Likewise, the hilsa is a middle-class favourite in Bangladesh, but an out-of-stock specialty item in America.
Inside, write: item for item in foo.
