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Derived variables for longitudinal studies
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DOI：10.1073/pnas.96.22.12273.png)
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Abstract
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Suppose that for each individual a vector of features is measured at a number of time points. We look for a transformation of the features, the same at all time points, that will induce a simple dependency structure. In the simplest situation this requires that a certain asymmetric matrix has real nonzero eigenvalues. Extensions are considered.
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