Search results for "sampling"

Influence of spatial precipitation sampling on hydrological response at catchment scale

2014

Retrieving precipitation data from raingauge network is a classical and common practice in hydrology and climatology. These data represent the key input in hydrological modeling to reproduce, for example, the characteristics of a flood phenomenon. The accuracy of the model results is strongly dependent on the consistency of the monitoring network in terms of spatial scale, i.e. network density and location of raingauges, and time resolution. In this context, several studies have been carried out to analyze how the rainfall sampling influences the estimation of total runoff volume. The aim of this paper is to use a physically based and distributed-parameter hydrologic model to investigate ho…

Successive Reduction of Arms in Multi-Armed Bandits

2011

The relevance of the multi-armed bandit problem has risen in the past few years with the need for online optimization techniques in Internet systems, such as online advertisement and news article recommendation. At the same time, these applications reveal that state-of-the-art solution schemes do not scale well with the number of bandit arms. In this paper, we present two types of Successive Reduction (SR) strategies - 1) Successive Reduction Hoeffding (SRH) and 2) Successive Reduction Order Statistics (SRO). Both use an Order Statistics based Thompson Sampling method for arm selection, and then successively eliminate bandit arms from consideration based on a confidence threshold. While SRH…

Health and Living Conditions of Refugees and Asylum-seekers: A Survey of Informal Settlements in Italy

2018

Newspapers and humanitarian organisations have long shown that many asylumseekers and other beneficiaries of international protection are forced to live for months or even years in precarious settlements that have sprung up spontaneously throughout Italy. However, there are no official statistics on how many asylum-seekers and refugees in Italy live this way. Our survey, carried out in 2015, is the first national survey of foreign nationals living in these makeshift camps. It aims to build a complete list of informal settlements in Italy and provide an estimate of the population size, characteristics, and living conditions of these settlements, with a focus on health conditions. The conditi…

Assessment of the Reliability of the SPAC Method in Urban Areas

2015

We have carried out several long-term measures of seismic noise with triangular arrays of broad-band seismic sensors, to investigate the reliability of the SPAC method in urban areas. We investigate the stationary and anisotropy of the microtremor wave field. We have found that the anisotropy of the microtremor wave field can be evaluated analyzing the HVNSR as function the azimuth. Furthermore, we showed as strong anisotropies in the microtremors are often observable in particular at high frequencies (> 1 Hz). We have verified as microtremors can be difficult to considered as ergodic processes, and for this reason time averaging, also even over a long periods of time, cannot replace an app…

Monte-Carlo Methods

2003

The article conbtains sections titled: 1 Introduction and Overview 2 Random-Number Generation 2.1 General Introduction 2.2 Properties That a Random-Number Generator (RNG) Should Have 2.3 Comments about a Few Frequently Used Generators 3 Simple Sampling of Probability Distributions Using Random Numbers 3.1 Numerical Estimation of Known Probability Distributions 3.2 “Importance Sampling” versus “Simple Sampling” 3.3 Monte-Carlo as a Method of Integration 3.4 Infinite Integration Space 3.5 Random Selection of Lattice Sites 3.6 The Self-Avoiding Walk Problem 3.7 Simple Sampling versus Biased Sampling: the Example of SAWs Continued 4 Survey of Applications to Simulation of Transport Processes 4.…

The status of dental caries and related factors in a sample of Iranian adolescents.

2010

Objective: To describe the status of dental caries in a sample of Iranian adolescents aged 14 to 18 years in Qazvin, and to identify caries-related factors affecting this group. Study design: Qazvin was divided into three zones according to socio-economic status. The sampling procedure used was a stratified cluster sampling technique; incorporating 3 stratified zones, for each of which a cluster of school children were recruited from randomly selected high schools. The adolescents agreed to participate in the study and to complete a questionnaire. Dental caries status was assessed in terms of decayed teeth (DT), filled teeth (FT) and decayed, missing and filled teeth (DMFT). A multivariate …

Empirical Research in Linguistics

2021

The rationality of acceptance in a nuclear community: analysing residents' opinions on the expansion of the SNF repository in the municipality of Eur…

2010

The project to build a final disposal repository for Spent Nuclear Fuel (SNF) in the municipality of Eurajoki, Finland, is approaching its 2012 deadline for the application of a construction licence. At the same time, the nuclear waste company Posiva is already planning to expand the disposal capacity of the repository. This paper addresses the question of acceptance among the residents of Eurajoki regarding the repository's expansion, and examines what aspects should be taken into consideration when explaining local opinions. The local acceptance figures for Eurajoki are analysed in relation to assumptions of the six common explanation types. The relationship between information deficit, s…

Recensione di G. Giaimo, La volontà e il corpo, Giappichelli, Torino, 2019, pp. 224

2021

Il contributo recensisce il volume di G. Giaimo, La volontà e il corpo, Torino, 2019, mettendo in evidenza i diversi temi trattati e l'approccio dell'analisi. The contribution reviews the volume by G. Giaimo, La volontà e il corpo, Turin, 2019, highlighting the different themes dealt with and the analysis approach.

Non-response bias as a likely cause of the association between young maternal age at the time of delivery and the risk of cancer in the offspring.

2003

Some epidemiological studies have shown an association between young maternal age at the time of delivery and risk of cancer in the offspring. In a recent German case-control study, there was a twofold increase in the leukaemia risk for children whose mothers were aged < 20 years at the time of delivery. As the prevalence of younger mothers among control families was particularly low, data on maternal age distributions for the general population of Germany were obtained in order to examine the representativeness of the control sample. Despite the excellent sampling frame based on data from complete and up-to-date population registries and a satisfactory response rate among controls ( approx…