Additive Seasonality in Time Series using Row and Overall Sample Variances of the Buys-Ballot Table
Kelechukwu C. N. Dozie *
Department of Statistics Imo State University, Owerri, Imo State, Nigeria.
Stephen O. Ihekuna
Department of Statistics Imo State University, Owerri, Imo State, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
This study considers test for seasonality in the additive model using the Buys-Ballot table and the nature of trending curves (linear, quadratic and exponential). The test is applied to the periodic and overall sample variances of the Buys-Ballot table to detect the presence and absence of seasonal indices in time series.
Keywords: Additive seasonality, periodic variance, overall variance, buys-ballot table, trending curves, seasonal indices