Kernel-based Conditional Independence Test and Application in Causal Discovery

Details Kernel-based Conditional Independence Test and Application in Causal Discovery Kernel-based Conditional Independence Test and Application in Causal Discovery

2012-02-14

arxiv.org/abs/1202.3775v1

Computer Science

Learning

Scientific paper

Conditional independence testing is an important problem, especially in Bayesian network learning and causal discovery. Due to the curse of dimensionality, testing for conditional independence of continuous variables is particularly challenging. We propose a Kernel-based Conditional Independence test (KCI-test), by constructing an appropriate test statistic and deriving its asymptotic distribution under the null hypothesis of conditional independence. The proposed method is computationally efficient and easy to implement. Experimental results show that it outperforms other methods, especially when the conditioning set is large or the sample size is not very large, in which case other methods encounter difficulties.

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