The paper considers two-phase random design linear regression models. The errors and the regressors are stationary long-range dependent Gaussian. The regression parameters, the scale parameters and the change-point are estimated using a method introduced by Rousseeuw and Yohai [33]. This is called S-estimator and it has the property that is more robust than the classical estimators; the outlier...

A general doubly adaptive biased coin design is proposed for the allocation of subjects to K treatments in a clinical trial. This design follows the same spirit as Efron’s biased coin design and applies to the cases where the desired allocation proportions are unknown, but estimated sequentially. Strong consistency, a law of the iterated logarithm and asymptotic normality of this design are obt...

Spatial environmental processes often exhibit dependence in their large values. In order to model such processes their dependence properties must be characterized and quantified. In this paper we introduce a measure that evaluates the dependence among extreme observations located in two separated regions of locations of R2. We compute the range of this new dependence measure, which extends the ...

In this paper, we have developed an approach to specify when updating materialized webviews. A webview is a web page that is automatically constructed from a structured database. We have introduced a new update policy called “early ondemand” update which is based on the user preferences. Then we have combines this policy with the on-demand one to update the materialized webviews. Our experiment...

Estimating gene mutation rates using DNA data from a population since its coalescence is an important part in the study of evolutionary genetic history, and is of its own interest also. There are a number of existing methods for this goal and are successful in application, but formal asymptotic study is absent except for the Watterson estimator, such as consistency of the estimator and its rate...

Optimistic replication is a fundamental technique for supporting collaborative work practices in mobile environments. However, eventual consistency, in contrast to immediate strong consistency in pessimistic replication, is much harder to evaluate. This paper analyzes different metrics for measuring the effectiveness of eventually consistent systems. Using results from a simulated environment o...

This paper studies the extensions of the infinte-horizon variants of the leximin principle and utilitarianism on the set of infinite utility streams. We especially examine those extensions which satisfy the axiom of Preference-continuity (or Consistency) and the extended anonymity axiom called Q-Anonymity. We formulate new extended leximin and utilitarian social welfare relations (SWRs), called...

To verify fixed-time constraints in grid workflow systems, the consistency and the inconsistency conditions have been defined in the conventional verification work. However, with a view of the run-time uncertainty of the activity completion duration, we argue that although the conventional consistency condition is fine, the conventional inconsistency condition is too rigorous and covers several...

Adaptive randomly reinforced urn (ARRU) is a two-color urn model where the updating process is defined by a sequence of non-negative random vectors {(D1,n, D2,n);n ≥ 1} and randomly evolving thresholds which utilize accruing statistical information for the updates. Let m1 = E[D1,n] and m2 = E[D2,n]. In this paper we undertake a detailed study of the dynamics of the ARRU model. First, for the ca...

We study the issue of data consistency in highly-available distributed systems. Specifically, we consider a distributed system that replicates its data at multiple sites, which is prone to partitions, and which is expected to be highly available. In such a setting, strong consistency, where all replicas of the system apply synchronously every operation, is not possible to implement. However, ma...