Author/Authors :
Rambli, Adzhar university of malaya - Institute of Mathematical Sciences, Malaysia , Ibrahim, Safwati university of malaya - Institute of Mathematical Sciences, Malaysia , Abdullah, Mohd Ikhwan university of malaya - Institute of Mathematical Sciences, Malaysia , Mohamed, Ibrahim university of malaya - Institute of Mathematical Sciences, Malaysia , Hussin, Abdul Ghapor university of malaya - Centre for Foundation studies in Sciences, Malaysia
Abstract :
This paper focuses on detecting outliers in the circular data which follow the wrapped normal distribution. We considered four discordance tests based on M, C, D and A statistics. The cut-off points of the four tests were obtained and the performance of the detection procedures was studied via simulations. In general, we showed that the discordance test based on the A statistic outperforms the other tests in all cases. For illustration, the city of Kuantan wind direction data set was considered
Keywords :
A statistics , circular , discordance , outlier , wrapped normal distribution
