A model of prospective time-estimation is introduced which explains the interplay of working memory demands on duration estimation. The approach is integrated into ACT-R and tested by estimating the duration of a task that varied coordinative and sequential demands on working memory. The comparison with experimental data shows that the model is able to simulate the influence of these demands on...

This document gives an introduction to the use of the function hhh4 for modelling univariate and multivariate time series of infectious disease counts. The function is part of the R-package surveillance, which provides tools for the visualization, modelling and monitoring of surveillance time series. The basic functionality of surveillance is introduced in the package vignette (Höhle et al., 20...

Neural networks were used to estimate the cost of jet engine components, specifically shafts and cases. The neural network process was compared with results produced by the current conventional cost estimation software and linear regression methods. Due to the complex nature of the parts and the limited amount of information available, data expansion techniques such as doubling-data and data-cr...

This introduction to the R package sphet is a (slightly) modified version of Piras (2010), published in the Journal of Statistical Software. sphet is a package for estimating and testing spatial models with heteroskedastic innovations. We implement recent generalized moments estimators and semiparametric methods for the estimation of the coefficients variance-covariance matrix. This paper is a ...

We discuss in this paper asymptotics of the sample average approximation (SAA) of the optimal value of a minimax stochastic programming problem. The main tool of our analysis is a specific version of the infinite dimensional delta method. As an example, we discuss asymptotics of SAA of risk averse stochastic programs involving the absolute semideviation risk measure. Finally, we briefly discuss...

In this paper we solve the problem about optimal interval quadrature formula for the class WrF of differentiable periodic functions with rearrangement invariant set F of their derivatives of order r. We prove that the formula with equal coefficients and n node intervals having equidistant midpoints is optimal for considering classes. To this end a sharp inequality for antiderivatives of rearran...