Evaluation of a wide-sky survey method for EAS experiments

Several ground-based Extensive Air Shower (EAS) experiments such as Asγ and Milagro have observed that CRs show large scale anisotropy in the TeV energy region with an amplitude of about 0.1%. As this phenomenon is very weak we have to deal carefully with potential errors introduced by analysis methods. In this paper, we discuss two methods for analyzing wide sky survey data, the Equi-Zenith angle method and a χ-Iteration method. The simulation results show that the χ-Iteration method can give accurate and reasonable results in the case of large scale anisotropy in data samples.