Andrade, I.C.; Clare, A.D.; O'Brien, R.J.; Thomas, S.H. - 1999
We develop tests for seasonal unit roots for daily data by extending the methodology of Hylleberg et al. ('Seasonal Integration and Cointegration', Journal of Econometrics, Vol. 44 (1990), No. 1–2, pp. 215–238) and apply our tests to UK and US daily stock market indices. We also investigate...