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arXiv math/0510436math.STstat.TH
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用PC算法估计高维有向无圈图

Estimating high-dimensional directed acyclic graphs with the PC-algorithm

Markus Kalisch, Peter Buehlmann

摘要:

我们认为PC算法Spirtes等。等人(2000)用于估计具有相应高斯分布的非常高维无环有向图(DAG)的骨架。PC算法对于具有许多节点(即变量)的稀疏问题在计算上是可行的,并且它具有自动实现高计算效率作为真实底层DAG的稀疏度的函数的吸引人的性质。我们证明了非常高维,稀疏DAG的算法的一致性,其中节点的数量允许快速增长的样本量n,快速为O(n^a)的任何0<a<无穷大。稀疏性假设是相当小的,仅要求DAG中的邻域的阶数低于样本量n。我们经验证明的PC算法模拟数据,并认为该算法是相当不敏感的选择,其单一的调谐参数。

英文摘要:

We consider the PC-algorithm Spirtes et. al. (2000) for estimating the skeleton of a very high-dimensional acyclic directed graph (DAG) with corresponding Gaussian distribution. The PC-algorithm is computationally feasible for sparse problems with many nodes, i.e. variables, and it has the attractive property to automatically achieve high computational efficiency as a function of sparseness of the true underlying DAG. We prove consistency of the algorithm for very high-dimensional, sparse DAGs where the number of nodes is allowed to quickly grow with sample size n, as fast as O(n^a) for any 0<a<infinity. The sparseness assumption is rather minimal requiring only that the neighborhoods in the DAG are of lower order than sample size n. We empirically demonstrate the PC-algorithm for simulated data and argue that the algorithm is rather insensitive to the choice of its single tuning parameter.

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