Abstract
Estimation of deterioration curve of infrastructure is one of hot topics. It is preferable to separate the data according to detailed information before estimation of regression curves. This study proposes a method to perform clustering of data and regression analysis at the same time statistically. Ordinary EM algorithm can deal only linear model though real world problems are often nonlinear. EM algorithm is a kind of local minimization method with respect to likelihood. In order to overcome these drawbacks, a new algorithm is proposed. The proposed method is a combination of EM algorithm and Distributed Particle Swarm Optimization (DPSO). After examining the efficiency of DPSO with simple test functions, a group of deterioration curves are estimated by the proposed algorithm.
