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Using post-war data on advanced economies, we find that a higher public debt ratio predicts marginally slower GDP growth under the assumption of a linear relationship. This result is robust to strong persistence in debt ratio, which may cause finite sample bias in estimation and inference. In the nonlinear framework, we find only weak support for piece-wise linear models that explicitly incorporate the idea of a debt tipping point. The threshold estimates from such models are subject to a high level of uncertainty and are sensitive to assumptions on minimum number of observations in each regime. However, using a flexible semiparametric model we uncover that the predictive function is highly complex and behaves quite differently at low, intermediate and high levels of debt. Of particular interest to the recent debate on effects of higher public indebtedness on growth, we find that average annual GDP growth gradually declines by about 0.5% as debt ratio climbs from about 75% to 100%, with most of the effect taking place over the 85-95% range. [ABSTRACT FROM AUTHOR]

We analyze the cyclical dynamics of the Turkish economy and the stock market as well as their interactions. We use hidden Markov models that are robust to parameter instability arising from major shifts in economic policy, which have been typically observed in the Turkish economy. These models provide estimates of turning points for the growth, business, and stock market cycles. We identify three states of growth cycles and two states of business cycles in Turkey characterized by different mean estimates. We find that the economy went through five recessions since 1987. Crises are characterized by sharp drops in economic activity and are preceded by slowdowns. These crises are typically followed by strong recoveries during which the economy grows above its long-run average rate. We show that the Turkish stock market goes through three regimes having distinct risk-return dynamics. Bear markets associated with negative returns precede every recession with an average lead time of three quarters, suggesting that the stock market may be a useful forward-looking indicator of the Turkish economy. [ABSTRACT FROM AUTHOR]

In this paper we investigate asymmetries in time-varying means, volatilities, correlations, and betas of equity returns in a multivariate threshold framework. We consider alternative specifications in which the threshold variable is based on well established equity pricing factors and predictors. We find strong threshold effects with respect to market excess return, value premium, and term spread. Our results indicate that the threshold model based on the market excess return provides a flexible and computationally inexpensive specification for modeling asymmetries. We test significance of specific forms of asymmetries using subsampling methods. We compare performance of the proposed threshold model with a variety of alternatives in an out-of-sample setup and find that the threshold model performs remarkably well, especially for investors with relatively high risk aversion. [ABSTRACT FROM AUTHOR]

We propose a new battery of dynamic specification tests for the joint hypothesis of iid-ness and density function based on the fundamental properties of independent random variables with identical distributions. We introduce a device-the autocontour-whose shape is very sensitive to departures from the null in either direction, thus providing superior power. The tests are parametric with asymptotic t and chi-squared limiting distributions and standard convergence rates. They do not require a transformation of the original data or a Kolmogorov style assessment of goodness-of-fit, explicitly account for parameter uncertainty, and have superior finite sample properties. An application to autoregressive conditional duration (ACD) models for trade durations shows that the difficulty with the assumed densities lies on the probability assigned to very small durations. Supplemental materials for this article are available online. [ABSTRACT FROM AUTHOR]