نتایج جستجو برای: aggregate data

تعداد نتایج: 2440932  

2008
Marko Hedler

This thesis researches the analysis and the formalised metadata mapping of moving data. Therefore a new syntagma for structuring document subparts in movies is being developed. The dissertation focuses on syntagmata which for the first time consider subparts of a document below the shot level. Until now, a set of shots could only be syntagmatically classified, if they were spatially connected. ...

2012
Anton Béguin

In the different tests and examinations that are used at a national level in the Netherlands, a variety of equating and linking procedures are applied to maintain assessment standards. This chapter presents an overview of potential sources of information that can be used in the standard setting of tests and examinations. Examples from test practices in the Netherlands are provided that apply so...

2015
Ioakeim Tzoulis Zacharoula S. Andreopoulou Marios Trigkas Georgios Tsekouropoulos Elias Voulgaridis

In wood trade, the supplier is the forest and the product is round wood. The quality, the quantity and value of wood depend heavily on the practices that are applied in the early stages of the supply chain. Current methods of the the productive capacity of forests, the annual consumption of wood and wood products, both from natural and technical forests and also from imports are presented. The ...

Journal: :Future Generation Comp. Syst. 1999
Alexander S. Szalay Robert J. Brunner

Astronomy is entering a new era as multiple, large area, digital sky surveys are in production. The resulting datasets are truly remarkable in their own right; however, a revolutionary step arises in the aggregation of complimentary multi-wavelength surveys (i.e. the cross-identification of a billion sources). Federating these different datasets, however, is an extremely challenging task. With ...

Journal: :Social Choice and Welfare 2008
Christian Bjørnskov Axel Dreher Justina A. V. Fischer

This paper explores a wide range of cross-country determinants of life satisfaction exploiting a database of 90,000 observations in 70 countries. We distinguish four groups of aggregate variables as potential determinants of satisfaction: political, economic, institutional, and human development and culture. We use ordered probit to investigate the importance of these variables on individual li...

2012
Itai Sher Kyoo il Kim

We study the nonparametric identification of distributions of utility functions in a multiple purchase setting with a finite number of consumers. Each utility function takes as arguments subsets or, alternatively, quantities of the multiple goods. We exploit mathematical insights from auction theory to generically identify the distribution of utility functions. We use price variation and aggreg...

2006
Dirk Krueger Hanno Lustig Fabrizio Perri

We evaluate the asset pricing implications of a class of models in which risk sharing is imperfect because of the limited enforcement of intertemporal contracts. Lustig (2004) has shown that in such a model the asset pricing kernel can be written as a simple function of the aggregate consumption growth rate and the growth rate of consumption of the set of households that do not face binding enf...

2014
Jing Ma Kirk Harland Gordon Mitchell

In the transport field, much attention is given to estimation and mitigation of CO2 emission. Much prior research has estimated CO2 emission using aggregate data on total energy consumed or average vehicles kilometres travelled (VKT), while not considering the influence on emission of factors that operate at a more resolved functional level, such as the neighbourhood-scale built environment (e....

2011
James M. Poterba Julio J. Rotemberg

This paper studies household asset demands by allowing certain assets to contribute directly to utility. It estimates the parameters of an aggregate utility function which includes both consumption and liquidity services. These liquidity services depend on the level of various asset stocks. We apply these estimates to investigate the longand short-run interest elasticities of demand for money, ...

2014
Ambarish Joshi Stephen Fancsali Steven Ritter Tristan Nixon Susan R. Berman

Recent work demonstrates that process data from intelligent tutoring systems (ITSs) can be used to predict student outcomes on high-stakes, standardized tests. Such models are important if ITSs are to be used for formative assessment and as replacements for external assessments. Recent work used various measures of learning efficiency and performance from problem-level, aggregate data from Carn...

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