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The effects of variance breaks on homogenous panel unit root tests

Herwartz, Helmut; Siedenburg, Florian - 2009

Noting that many economic variables display occasional shifts in their second order moments, we investigate the performance of homogenous panel unit root tests in the presence of permanent volatility shifts. It is shown that in this case, panel unit root tests derived under time invariant...

Persistent link: https://www.econbiz.de/10003887238

A new approach to bootstrap inference in functional coefficient models

Herwartz, Helmut (contributor); Fang, Xu (contributor) - 2007

We introduce a new, factor based bootstrap approach which is robust under heteroskedastic error terms for inference in functional coefficient models. Modeling the functional coefficient parametrically, the bootstrap approximation of an F statistic is shown to hold asymptotically. In simulation...

Persistent link: https://www.econbiz.de/10003477963

State dependence in the finance-growth nexus : a functional coefficient approach

Herwartz, Helmut; Yabibal Mulualem Walle - 2013

Noting that "one size does not fit all" in the case of the finance-growth (FG) nexus, a growing body of literature has recently focused on uncovering economic conditions under which financial development could be beneficial (detrimental) to economic development. We look into these conditions by...

Persistent link: https://www.econbiz.de/10009752169

An empirical study on causes and consequences of inflation and inflation uncertainty

Hartmann, Matthias - 2012

Empirical study of causality between inflation, inflation uncertainty and other macroeconomicy quantities. Additionally, the issue of how to measure the unobservable inflation uncertainty is addressed.

Persistent link: https://www.econbiz.de/10009671994

A functional coefficient model view of the Feldstein-Horioka puzzle

Herwartz, Helmut (contributor); Fang, Xu (contributor) - 2007

What does the saving-investment (SI) relation really measure and how should the (SI) relation be measured? These are two of the most discussed issues triggered by the so called Feldstein-Horioka puzzle. Based on panel data we introduce a new variant of functional coefficient models that allow to...

Persistent link: https://www.econbiz.de/10003477959

Long-run links among money, prices, and output : world-wide evidence

Herwartz, Helmut; Reimers, Hans-Eggert - 2001

analyse this topic by means of a P-star model. Based on the quantity theory of money, this approach explains inflation via a …. Moreover, parameter restrictions for the long-run relationships implied by the monetary theory are tested. Country specific P … Preisniveau und dem realen Output testet. Weiterhin werden die Parameterrestriktionen, die sich durch die monet¨are Theorie …

Persistent link: https://www.econbiz.de/10011419407

Modelling the Fisher hypothesis: World wide evidence

Herwartz, Helmut (contributor); … - 2006

In this paper we follow an empirical approach to examine the implications of the Fisher hypothesis, namely cointegration linking interest rates and inflation, and stationarity of the real interest rate implying in turn homogeneity of the potential equilibrium relation. The considered sample is...

Persistent link: https://www.econbiz.de/10003296858

Exchange rate uncertainty and trade growth : a comparison of linear and nonlinear (forecasting) models

Herwartz, Helmut (contributor); Weber, Henning (contributor) - 2007

A huge body of empirical and theoretical literature has emerged on the relationship between foreign exchange (FX) uncertainty and international trade. Empirical findings about the impact of FX uncertainty on trade figures are at best weak and often ambiguous with respect to its direction. Almost...

Persistent link: https://www.econbiz.de/10003634011

On economic evaluation of directional forecasts

Blaskowitz, Oliver; Herwartz, Helmut - 2009

It is commonly accepted that information is helpful if it can be exploited to improve a decision making process. In economics, decisions are often based on forecasts of up- or downward movements of the variable of interest. We point out that directional forecasts can provide a useful framework...

Persistent link: https://www.econbiz.de/10003893151

Testing the correlated random coefficient model

Heckman, James J.; Schmierer, Daniel; Urzua, Sergio - 2009

The recent literature on instrumental variables (IV) features models in which agents sort into treatment status on the basis of gains from treatment as well as on baseline-pretreatment levels. Components of the gains known to the agents and acted on by them may not be known by the observing...

Persistent link: https://www.econbiz.de/10003907131