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Tim Bates' R command bundle for TextMate 2 (http://macromates.com)
A question that is specific to the twin design concerns the manner of allocation of twins to batches. One may allocate randomly by individual twin, or randomly by twin pair. The following are the results of simulation studies carried out to answer this question in three situations. Simulation 1. Random effects model. Simulation 2: fixed batch effects in two steps or one step. Simulation 3: More extreme selection and fixed plate effects in two step or one step. Simulation 4: estimating genetic and non-genetic variance components in the twin design.