Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2005-07-23
Nonlinear Sciences
Chaotic Dynamics
Scientific paper
We propose an exact nonparametric inference scheme for the detection of nonlinear determinism. The essential fact utilized in our scheme is that, for a linear stochastic process with jointly symmetric innovations, its ordinary least square (OLS) linear prediction error is symmetric about zero. Based on this viewpoint, a class of linear signed rank statistics, e.g. the Wilcoxon signed rank statistic, can be derived with the known null distributions from the prediction error. Thus one of the advantages of our scheme is that, it can provide exact confidence levels for our null hypothesis tests. Furthermore, the exactness is applicable for finite samples with arbitrary length. We demonstrate the test power of this statistic through several examples.
Luo Xiaodong
Moroz Irene
Small Michael
Zhang Jie
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