نتایج جستجو برای: internal validity

تعداد نتایج: 333180  

Journal: :Educational Technology & Society 2015
Brian R. Belland Andrew E. Walker Megan Whitney Olsen Heather Leary

This paper employs meta-analysis to determine the influence of computer-based scaffolding characteristics and study and test score quality on cognitive outcomes in science, technology, engineering, and mathematics education at the secondary, college, graduate, and adult levels. Results indicate that (a) computer-based scaffolding positively influences learning (g = 0.53), (b) studies with zero ...

2003
Jaume Puig-Junoy

The objective of this paper is to describe empirical studies evaluating the impact of reference pricing interventions in pharmaceutical markets, and to assess the quality of their evaluation method. A total of ten studies were included in the review. The nature of the intervention, the nature of the data available, the nature of the question to be answered, and the requirements of the evaluatio...

2008
PHILIPPE F. LACHEREZ

Honing and Ladinig (2008) make the assertion that while the internal validity of web-based studies may be reduced, this is offset by an increase in external validity possible when experimenters can sample a wider range of participants and experimental settings. In this paper, the issue of internal validity is more closely examined, and it is agued that there is no necessary reason why internal ...

2012
ELENA CAMISASCA SIMONA C. S. CARAVITA LUCA MILANI PAOLA DI BLASIO

This study was aimed to validate the Italian version of the Children’s Coping Strategies Checklist-Revision1 (CCSC-R1; Ayers & Sandler, 1999). Seven hundred and forty-seven youngsters (50.5% boys) from two age groups (children: aged 9-10; early adolescents: aged 11-14) participated in the study. Dimensionality of the CCSC-R1 was explored by means of confirmatory factor analyses and testing alte...

2012
Brian A. Nosek N. Sriram Emily Umansky

In two large web-based studies, across five distinct criteria, presenting survey items one-at-a-time was psychometrically either the same or better than presenting survey items all-at-once on a single web page to volunteer participants. In the one-at-a-time format, participants were no more likely to drop-out of the study (Criterion 1), and were much more likely to provide answers for the surve...

2005
M.Tevfik DORAK

Introduction In epidemiologic research, it is essential to avoid bias, to control confounding and to undertake accurate replication. Bias, confounding and random variation/chance are the non-causal reasons for an association between an exposure and outcome. These major threats to internal validity of a study should always be considered as alternative explanations in the interpretation. Bias is ...

2017
Katherine Livins Jay Martin

This half-day workshop will discuss how to enrich research by marrying academic and industry-based work. Attendees will learn the theoretical, practical, and logistical complexities involved in advancing cognitive science across these distinct research sites. This topic is relevant to the cognitive community because academia and industry often have common goals but distinct capabilities. For ex...

2008
P. Michael Ho N. Peterson Frederick A. Masoudi

Health outcomes research applies a wide range of methods to identify optimal approaches to determine optimal approaches to determine the effects of healthcare interventions and policies. Critical evaluation skills are necessary to navigate the evidence and identify studies that should influence clinical decision making and policy. A hierarchical “pyramid of evidence” that emphasizes randomized ...

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