In a general variance component model with positive variance components a short-cut method is presented that yields almost everywhere for these components positive estimators that are invariant with respect to mean value translation and stay near the unbiasedness.

Welfare in a two-product Cournot oligopoly is shown to increase (decrease) with an increase incorrelation between unit costs when the outputs complement (substitute) in demand. A morequalified correlation structure is required for the result to apply in a three-product Cournotoligopoly when...

We have developed a new test against spurious long memory based on the invarianceof long memory parameter to aggregation. By using the local Whittleestimator, the statistic takes the supremum among combinations of paired aggregatedseries. Simulations show that the test performs good in nite...

In diesem Beitrag wird mit Galtungs Konzept der „Suche und Brechung von Invarianzen“ einin der betriebswirtschaftlichen Diskussion um die Kausalanalyse kaum beachtetes Konzeptzum Umgang mit festgestellten Wirkungszusammenhängen vorgestellt. Dabei wirdinsbesondere die Rolle der...

In a general variance component model with positive variance components a short-cut method is presented that yields almost everywhere for these components positive estimators that are invariant with respect to mean value translation and stay near the unbiasedness.