Hybrid time series data often require special care in estimating seasonal factors. Series such as the state and metro area Current Employment Statistics produced by the Bureau of Labor Statistics (BLS) are composed of two different source series that often have two different seasonal patterns....

We test for seasonality in returns of various industry indices in the Istanbul Stock Exchange. The residual returns for all the industry indices in the Turkish stock market are computed and analyzed using the CAPM model. The empirical evidence based on monthly return data from MATRİKS points...