This paper examines persistence in the Ukrainian stock market during the recent financial crisis. Using two different long memory approaches (R/S analysis and fractional integration) we show that this market is inefficient and the degree of persistence is not the same in different stages of the...

We investigate in this article the implications that seasonal misspecificationproduces in the context of fractionally integrated models. We use a versionof the tests of Robinson (1994) that permits us to test both deterministic andstochastic seasonality. Several Monte Carlo experiments are...

This study examines the relationship between healthcare expenditure and disposable income in the 50 US states over the period 1966-2009 using fractional integration and cointegration techniques. The degree of integration and nonlinearity of both series are found to vary considerably across...