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181.
We consider maximum likelihood estimation and likelihood ratio tests under inequality restrictions on the parameters. A special
case are order restrictions, which may appear for example in connection with effects of an ordinal qualitative covariate.
Our estimation approach is based on the principle of sequential quadratic programming, where the restricted estimate is computed
iteratively and a quadratic optimization problem under inequality restrictions is solved in each iteration. Testing for inequality
restrictions is based on the likelihood ratio principle. Under certain regularity assumptions the likelihood ratio test statistic
is asymptotically distributed like a mixture of χ2, where the weights are a function of the restrictions and the information matrix. A major problem in theory is that in general
there is no unique least favourable point. We present some empirical findings on finite-sample behaviour of tests and apply
the methods to examples from credit scoring and dentistry. 相似文献
182.
183.
This paper presents an easy-to-compute semi-parametric (SP) method to estimate a simple disequilibrium model proposed by Fair and Jaffee (1972). The proposed approach is based on a non-parametric interpretation of the EM (Expectation and Maximization) principle (Dempster et al; 1977) and the least squares method. The simple disequilibrium model includes the demand equation, the supply equation, and the condition that only the minimum of quantity demanded and quantity supplied is observed. The method used here allows one to consistently estimate the disequilibrium model without fully specifying the distribution of error terms in both demand and supply equations. Our Monte Carlo study suggests that the proposedestimator is better than the normal maximum likelihood estimator under asymmetric error distributions. and comparable to the nlaximunl likelihood estimator under synirnetric error distributions in finite samples. Aggregate U.S. labor market data from Quandt and Rosen (1988) is used to illustrate the procedure. 相似文献
184.
ON ESTIMATION OF LONG-MEMORY TIME SERIES MODELS 总被引:1,自引:0,他引:1
This paper discusses estimation associated with the long-memory time series models proposed by Granger & Joyeux (1980) and Hosking (1981). We consider the maximum likelihood estimator and the least squares estimator. Certain regularity conditions introduced by several authors to develop the asymptotic theory of these estimators do not hold in this model. However we can show that these estimators are strongly consistent, and we derive the limiting distribution and the rate of convergence. 相似文献
185.
For non-negative integral valued interchangeable random variables v1, v2,…,vn, Takács (1967, 70) has derived the distributions of the statistics ?n' ?1n' ?(c)n and ?(-c)n concerning the partial sums Nr = v1 + v2 + ··· + vrr = 1,…,n. This paper deals with the joint distributions of some other statistics viz., (α(c)n, δ(c)n, Zn), (β(c)n, Zn) and (β(-c)n, Zn) concerning the partial sums Nr = ε1 + ··· + εrr = 1,2,…,n, of geometric random variables ε1, ε2,…,εn. 相似文献
186.
王美娟 《上海理工大学学报(社会科学版)》1991,(4)
随着科学技术的发展,一类重要方程——差分方程已越来越广泛地被科枝工作者所应用。本文讨论了一类离散大系统关于部分变元渐近稳定性的判定方法,该方法切实可行。 相似文献
187.
The Weibull extension model is a useful extension of the Weibull distribution, allowing for bathtub shaped hazard rates among other things. Here, we consider estimation of the PDF and the CDF of the Weibull extension model. The following estimators are considered: uniformly minimum variance unbiased (UMVU) estimator, maximum likelihood (ML) estimator, percentile (PC) estimator, least squares (LS) estimator, and weighted least squares (WLS) estimator. Analytical expressions are derived for the bias and the mean squared error. Simulation studies and real data applications show that the ML estimator performs better than others. 相似文献
188.
This short article extends well-known threshold models to the ordered response setting. We consider the case where the sample is endogenously split to estimate regime-dependent coefficients for one variable of interest, while keeping the other coefficients and auxiliary parameters constant across the threshold. We use Monte Carlo methods to examine the behavior of the model. In addition, we derive the formulae for the partial effects associated with the model. We apply our threshold model to the relationship between income and self-reported happiness using data drawn from the U.S. General Social Survey. While the findings suggest the presence of a threshold in the income-happiness gradient at approximately U.S. $76,000, no evidence is found in support of a satiation point. Supplementary materials for this article are available online. 相似文献
189.
Hypotheses were developed to capture the dynamic capabilities that result from interfirm partnerships during the joint new product development (NPD) process—the ability to build, integrate, and reconfigure existing resources to adapt to rapidly changing environments. These capabilities, in turn, were proposed to have a positive impact on NPD performance outcomes: (a) proportion of new product success and (b) superior new product commercialization. In contexts where the locus of innovation is rapidly changing, the impact of interfirm NPD dynamic capabilities was hypothesized to be diminished in high‐technology contexts, especially for buyers (original equipment manufacturers) and to a lesser extent for suppliers. Still, technology‐based interfirm NPD partnerships were predicted to ultimately outperform low‐technology ones in both NPD performance outcomes. Finally, information technology (IT) support for NPD was hypothesized to influence the interfirm NPD partnership's dynamic capabilities. Using survey data from 72 auto company managers and their suppliers, the proposed model in which IT support for NPD influences the success of interfirm NPD partnerships through the mediating role of interfirm NPD partnership dynamic capabilities in high‐ and low‐technology contexts was generally supported. The results shed light on the nature of technology‐based interfirm NPD partnerships and have implications for their success. Theoretical and managerial implications are discussed. 相似文献
190.