Experimental and longitudinal data for scientific and policy research: Open access to data collected in the longitudinal internet studies for the social sciences

This chapter presents the Dutch Longitudinal Internet Studies for the Social sciences (LISS) panel. This infrastructure provides an innovative method of data collection and data access. It offers researchers the opportunity to field surveys and conduct experiments, to analyze the effect of interventions, and to link collected survey data to administrative data available from Statistics Netherlands. The infrastructure is used mostly by academic researchers but also by applied researchers, in a wide variety of studies in various disciplines. The authors demonstrate how the LISS infrastructure can be used to carry out relevant scientific and policy research to tackle contemporary societal challenges. The examples of policy-relevant research presented here focus on the adequacy of retirement savings, retirement expenditure goals, and the behavioral responses of individuals to certain policies through stated preference analyses

Out-of-sample forecast errors in misspecific perturbed long memory processes

Perturbed long-memory, correlogram, forecast error,

α-stable laws for noncoding regions in DNA sequences

In this work, we analyze the long-range dependence parameter for a nucleotide sequence in several different transformations. The long-range dependence parameter is estimated by the approximated maximum likelihood method, by a novel estimator based on the spectral envelope theory, by a regression method based on the periodogram function, and also by the detrended fluctuation analysis method. We study the length distribution of coding and noncoding regions for all Homo sapiens chromosomes available from the European Bioinformatics Institute. The parameter of the tail rate decay is estimated by the Hill estimator ˆα. We show that the tail rate decay is greater than 2 for coding regions, while for almost all noncoding regions it is less than 2.

Sardine regime shifts off Portugal:a time series analysis of catches and wind conditions

Decadal changes have been observed in the annual catch of sardine (Sardina pilchardus W). Long-term changes have also been observed in alongshore winds off Portugal in the last decades in winter months. During sardine spawning season (winter), northerly winds that favour upwelling led to unfavourable conditions for egg and larval survival. By using time series analysis, we investigated the effect of wind conditions and North Atlantic Oscillation (NAO) on the sardine catches, in the period from 1946-1991. We also investigated the time lag between recruitment strength and its turnout in catches. We concluded that recruitment is forced to a lower level when the frequency and intensity of northerly wind exceeds a certain limit in winter. Our time series retrospective analyses led to evidence of climatic driven regime-shifts in West Portugal sardine productivity in late 1960s-early 1970s. These results are discussed in terms of their implications in fisheries management plans