# Generalized Principal Components Analysis and its Application in Approximate Stochastic Realization

## Abstract

The state of a linear system is an information interface betwen the past and the future, and approximate realization is essentially a problem of approximating an apparently high-dimensional interface by a low-order partial state. In this chapter, we generalize the ideas of principal components to the problem of approximating the information interface between two random vectors. Two such generalizations exist in the statistical literature [1,2]. Applications of these generalizations to the partial-state selection problem lead to three approximate stochastic realization methods. We discuss these methods and the partial-state selection criterion that each optimizes. We also study their relation to determinstic identification and balanced model reduction.

### Keywords

Entropy Covariance Beach Expense Convolution## Preview

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