A binary tree algorithm on change points detection

In this paper, an algorithm using binary trees is developed to detect the change points of a data set in which the data are assumed to be normally distributed. Usual BIC-type criteria are considered in the binary searching procedures when the number of change points is unknown. The algorithm is also extended to the switching regression models. Simulation study confirms that our algorithm is efficient compared with the ML-method. A real data example also verifies that the proposed procedure is appropriate.     

Asymptotics for duration-driven long range dependent processes

We consider processes with second order long range dependence resulting from heavy tailed durations. We refer to this phenomenon as duration-driven long range dependence (DDLRD), as opposed to the more widely studied linear long range dependence based on fractional differencing of an i.i.d. process. We consider in detail two specific processes having DDLRD, originally presented in Taqqu and Levy [1986. Using renewal processes to generate long-range dependence and high variability. Dependence in Probability and Statistics. Birkhauser, Boston, pp. 73–89], and Parke [1999. What is fractional integration? Review of Economics and Statistics 81, 632–638]. For these processes, we obtain the limiting distribution of suitably standardized discrete Fourier transforms (DFTs) and sample autocovariances. At low frequencies, the standardized DFTs converge to a stable law, as do the standardized sample autocovariances at fixed lags. Finite collections of standardized sample autocovariances at a fixed set of lags converge to a degenerate distribution. The standardized DFTs at high frequencies converge to a Gaussian law. Our asymptotic results are strikingly similar for the two DDLRD processes studied. We calibrate our asymptotic results with a simulation study which also investigates the properties of the semiparametric log periodogram regression estimator of the memory parameter.     

The Relationships between Resource Configurations and Launch Strategies in Taiwan's IC Design Industry: An Exploratory Study

Within the last decade, the link between launch strategies and new product performance has been widely investigated. However, the relationship between resource configurations and launch strategies has received little attention. This study endeavors to fill that void by examining the relationships between resource configurations and launch strategy selections. In addition, this study investigates the moderating effects of market growth and competitiveness on the relationship between resources and launch strategies. Drawing on contingency theory and strategic studies, this study proposes that resource contingencies affect changes in launch strategies. This study also suggests that market characteristics play a contingent role in the relationships between the configurations of resources and launch strategy choices. Based on extensive studies reporting on market characteristics and their links to strategies, this study proposes that two market characteristics—market growth and competitiveness—are relevant for launch strategy decision making. Taiwan's integrated circuit (IC) design industry has been used as the analytical sample, as it has been identified as a promising sector for new product development. Based on the result of investigating 90 firms, four resource configurations are identified: (1) strategic and organizational abilities; (2) technological capabilities; (3) societal assets and goodwill; and (4) physical assets. Furthermore, two different launch strategies—innovative and product advantage and cost oriented—also are discovered. The results from a seemingly unrelated regression model reveal that technological capabilities and societal assets and goodwill contribute to the variation in the firms' choices of launch strategies. This study further conducted the simple slope analysis to observe the effect of the technological capabilities on the innovative and product advantage strategy under different levels of the market growth rate. The results interestingly showed that firms with technological capabilities demonstrated different degree of tendencies in employing this strategy in alignment with various market growth rates. The finding sheds some lights on the moderating role market characteristics play on the relationships between resource configurations and launch strategy selections. Academic implications and suggestions for practitioners also are provided.     

Market structure, pigouvian taxation, and welfare

Using a short-run partial equilibrium model of social welfare, this paper examines the social welfare implications of changing Pigouvian taxes under three markets: perfect competition, monopoly, and Cournot oligopoly. The result for perfect competition supports the earlier finding that Pigouvian taxation increases social welfare [Buchanan, 1969]. However, in contrast to the previous result that Pigouvian taxes lower welfare under monopoly, the authors show that if the noncompetitive distortion is small, these taxes might still be useful in correcting monopoly-generated externalities and in improving social welfare. Cournot firms react to the tax depending upon their individual perceptions of the gain in post-tax marginal revenue. Policy implications of the study's results are discussed.