The paper modifies previously suggested GMM approaches to spatial autoregression in stock returns. Our model incorporates global dependencies, dependencies inside industrial branches and local dependencies. As can be seen from Euro Stoxx 50 returns, this combination of spatial modeling and...

We present a test to determine whether variances of time series are constant over time. The test statistic is a suitably standardized maximum of cumulative first and second moments. We apply the test to time series of various assets and find that the test performs well in applications. Moreover,...

type="main" xml:lang="es" <title type="main">Resumen</title> <p>Hemos modificado un estimador GMM sugerido previamente en un modelo de regresión de panel espacial, que ha recibido recientemente un gran interés en las aplicaciones empíricas, teniendo en cuenta la diferencia entre las perturbaciones y los residuos de la...</p>

We analyze a new fluctuation test for constant correlation with respect to its properties and possible applications in finance. On the one hand, a simulation study examines the properties particularly with regard to a comparison with a previous standard method. On the other hand, we apply the...

We suggest an improved GMM estimator for the autoregressive parameter of a spatial autoregressive error model by taking into account that unobservable regression disturbances are different from observable regression residuals.