Detecting Spatial Clusters via a Mixture of Dirichlet Processes

Abstract EN

We proposed an approach that has the ability to detect spatial clusters with skewed or irregular distributions.

A mixture of Dirichlet processes (DP) was used to describe spatial distribution patterns.

The effects of different batches of data collection efforts were also modeled with a Dirichlet process.

To cluster spatial foci, a birth-death process was applied due to its advantage of easier jumping between different numbers of clusters.

Inferences of parameters including clustering were drawn under a Bayesian framework.

Simulations were used to demonstrate and assess the method.

We applied the method to an fMRI meta-analysis dataset to identify clusters of foci corresponding to different emotions.