Principal Component Analysis of Fractional Brownian Motion

نویسندگان

  • Li Li
  • Zhiheng Li
  • Yi Zhang
  • Yudong Chen
چکیده

This paper gives an analytical proof of the conjecture [1]: when the dimension M of the auto-covariance matrix is large, the eigenvalue spectrum from Principal Component Analysis (PCA) of a fractal Brownian motion (fBm) process with Hurst parameter H decays as a power-law: λm ∼ m −(2H+1), m = 1,..., M . This resolves the interesting puzzle why PCA based H estimator can yield right results for fBm processes with 1/2 < H < 1.

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تاریخ انتشار 2008