Derived variables for longitudinal studies.
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- Record sourced from PubMed, PMID 10535911.
- Also identified by PMC identifier 22906.
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Abstract
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.