نتایج جستجو برای: external validity

تعداد نتایج: 298093  

2002
Susan Elliott Sim Richard C. Holt Steve M. Easterbrook

In this paper, we take the concept of benchmarking as used extensively in computing and apply it to evaluating C++ fact extractors. We demonstrated the efficacy of this approach by developing a prototype benchmark, CppETS 1.0 (C++ Extractor Test Suite, pronounced see-pets) and collecting feedback in a workshop setting. The CppETS benchmark characterises C++ extractors along two dimensions: Accu...

2009
Brian E. Roe David R. Just Stephan Marette Ernst Fehr Rachel Croson

In the realm of empirical research, investigators are first and foremost concerned with the validity of their results, but validity is a multi-dimensional ideal. In this article we discuss two key dimensions of validity – internal and external validity – and underscore the natural tension that arises in choosing a research approach to maximize both types of validity. We propose that the most co...

2012
Roger Stover

Very Preliminary; Please do not quote 2 Abstract: More on the Link between Deposit Insurance and Depositor Behavior: Experimental Results This paper employs an experimental model to provide additional insight into the effect explicit deposit insurance has on depositor behavior in the time of a bank crisis. The strength of the conjoint approach used in this study is that it combines the control ...

2012

a. What is meant by this item: Differences in demographic, husbandry and severity of disease features between populations may produce measures of diagnostic accuracy that vary considerably. The item refers more to the generalisability or external validity of the results than to the possibility that the study may produce biased results. Reported estimates of diagnostic accuracy may have limited ...

2012
Barbara Sianesi

The UK Employment Retention and Advancement (ERA) programme has been evaluated by a large-scale randomised experiment. It has however emerged that due to the experimental set-up over one quarter of the eligible population was not represented in the experiment: some eligibles actively refused to be randomly assigned, while some were somehow not even offered the possibility to participate in rand...

Journal: :Information & Management 1988
Randolph B. Cooper James T. Mackey

da However, the exploratory nature of this study imposts significant pro&ms of external validity. ~~age~e~t information, cost variance reportiq$ cost dent rIlamhcturing. [lo]. However. all MISS contain inaccuracies and limitations. The question, then, is when variance-tracking IISs are deficient enough to warrant changing or abandoning them. Evidence from the literatsre is far from @otciu-sive....

2014
Marjorie Taylor Natalie G. Brezack

This study explores the extent that teaching adolescent girls to sew their own clothes works as an intervention to improve self-esteem, optimism, and self-efficacy. Twenty-six adolescent girls between the ages of 11 and 16 participated in a sewing class, held once per week for three hours over five weeks. Participants completed questionnaires on self-esteem, optimism, and self-efficacy. Self-es...

2006
John E. Eck

Increasing attention is being paid to the systematic review and synthesis of evaluations of large-scale, generic, crime prevention programs. The utility of these syntheses rests on the assumption that the programs are designed to work across a wide variety of contexts. But many police problem-solving efforts and situational prevention interventions are small-scale efforts specifically tailored ...

Journal: :journal of teaching language skills 2012
behzad ghonsooly majid elahi

locus of control is said to affect learners' academic achievement. this effect has scarcely been examined within general english context. this study is concerned with examining the differences in general english (ge) course achievement among university students of humanities, sciences, and engineering. it also explores the effect of locus of control (loc) in ge course achievement among these th...

2007
Gary Charness Marie-Claire Villeval

Cooperation, Competition, and Risk Attitudes: An Intergenerational Field and Laboratory Experiment The population of most developed societies is ‘graying’. As life expectancy increases and the large baby-boom generation approaches retirement age, this has critical consequences for maintaining a high standard of living and the sustainability of pension systems. In the light of these labor-force ...

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