A study of results overlap and uniqueness among major Web search engines     

Amanda Spink  Bernard J. Jansen  Chris Blakely  Sherry Koshman 《Information processing & management》2006

The performance and capabilities of Web search engines is an important and significant area of research. Millions of people world wide use Web search engines very day. This paper reports the results of a major study examining the overlap among results retrieved by multiple Web search engines for a large set of more than 10,000 queries. Previous smaller studies have discussed a lack of overlap in results returned by Web search engines for the same queries. The goal of the current study was to conduct a large-scale study to measure the overlap of search results on the first result page (both non-sponsored and sponsored) across the four most popular Web search engines, at specific points in time using a large number of queries. The Web search engines included in the study were MSN Search, Google, Yahoo! and Ask Jeeves. Our study then compares these results with the first page results retrieved for the same queries by the metasearch engine Dogpile.com. Two sets of randomly selected user-entered queries, one set was 10,316 queries and the other 12,570 queries, from Infospace’s Dogpile.com search engine (the first set was from Dogpile, the second was from across the Infospace Network of search properties were submitted to the four single Web search engines). Findings show that the percent of total results unique to only one of the four Web search engines was 84.9%, shared by two of the three Web search engines was 11.4%, shared by three of the Web search engines was 2.6%, and shared by all four Web search engines was 1.1%. This small degree of overlap shows the significant difference in the way major Web search engines retrieve and rank results in response to given queries. Results point to the value of metasearch engines in Web retrieval to overcome the biases of individual search engines.  相似文献   

Infant-toddler teachers can successfully employ authentic assessment: The Learning Through Relating system     

Amanda J. Moreno  Mary M. Klute 《Early childhood research quarterly》2011,26(4):484

This study documents the reliability and validity of a new infant-toddler authentic assessment, the Learning Through Relating Child Assets Record (LTR-CAR), and its feasibility of use by infant-toddler caregivers in an Early Head Start program. In a sample of 136 children, results indicated a strong internal structure of the LTR-CAR as evidenced by high internal consistency within age bands, expected performance in terms of the order of difficulty of items, and expected performance relative to the chronological ages of children. Moreover, the LTR-CAR accounted for a statistically significant amount of unique variance (between 6 and 26%), over and above age and gender, in six out of eight regressions predicting criterion measures. Given the increasing numbers of infants and toddlers in non-parental care, the need for authentic assessment as a tool to plan meaningful learning opportunities, as well as the lack of evidence-based authentic assessment options at the infant-toddler level, the LTR-CAR may provide a viable option for the field.  相似文献   

Pragmatic language in deaf and hard of hearing students: correlation with success in general education     

Thagard EK  Hilsmier AS  Easterbrooks SR 《American annals of the deaf》2011,155(5):526-534

Deaf and hard of hearing children have shown delays and difficulties in pragmatic behaviors due to insufficient exposure to common daily discourse and underlying impoverishment in all components of language development. In a study in a school district in a southeastern U.S. state, the researchers investigated the relationship between sociolinguistic pragmatic competence in 81 deaf and hard of hearing students and these students' degree of hearing loss, communication mode, and degree of success in general education. Two measures, one devised by the state's department of education and one developed within the local school system, were used: the Criterion-Referenced Competency Test (Georgia Department of Education, 2000) and the Socio-Pragmatic Skills Checklist for Deaf and Hard of Hearing Students (Cobb County School District, 1997). The researchers found that whether the students used spoken language or signed language, socio-pragmatic language had a high, positive correlation with academic outcomes.  相似文献   

Two-year-olds use the generic/nongeneric distinction to guide their inferences about novel kinds     

Graham SA  Nayer SL  Gelman SA 《Child development》2011,82(2):493-507

These studies investigated two hundred and forty-four 24- and 30-month-olds' sensitivity to generic versus nongeneric language when acquiring knowledge about novel kinds. Toddlers were administered an inductive inference task, during which they heard a generic noun phrase (e.g., "Blicks drink milk") or a nongeneric noun phrase (e.g., "This blick drinks milk") paired with an action (e.g., drinking) modeled on an object. They were then provided with the model and a nonmodel exemplar and asked to imitate the action. After hearing nongeneric phrases, 30-month-olds, but not 24-month-olds, imitated more often with the model than with the nonmodel exemplar. In contrast, after hearing generic phrases, 30-month-olds imitated equally often with both exemplars. These results suggest that 30-month-olds use the generic/nongeneric distinction to guide their inferences about novel kinds.  相似文献   

Teacher education for inclusion in Europe     

Verity Donnelly  Amanda Watkins 《Prospects》2011,41(3):341-353

Teacher education issues are high on the policy agenda across Europe. The United Nations Convention on the Rights of People with Disabilities (2006) is gaining momentum and providing a force for change, supported by many communications both internationally and at European level that recognize how central education is in efforts to develop a more equitable society. In moving towards a more inclusive education system, there is a need to train all teachers to meet the diverse needs of all learners in their classrooms and to work collaboratively with colleagues. Drawing on key documents, this article outlines the policy context and reviews the available evidence supporting the move towards teacher education for inclusion across Europe. It presents the work of the European Agency for Development in Special Needs Education, to highlight some of the opportunities and challenges within its member countries in addressing teacher education for inclusion.  相似文献   

Supporting minority students through a reflexive approach to empowerment     

Amanda Keddie 《British Journal of Sociology of Education》2011,32(2):221-238

Referring to the experiences of three Muslim refugee girls recently settled in Australia, this paper examines issues of schooling and empowerment. The paper draws on teacher and student interview data from a study that investigated inclusive approaches to addressing issues of cultural diversity in a secondary state high school in Queensland. The paper foregrounds the girls’ highly positive views of their experiences at the school; views that reflect the girls’ access to spaces of empowerment but belie the complexity and tensions involved in how empowerment was understood and approached by educators at the school. Theorising empowerment through poststructural understandings of agency, the paper examines conditions and ways of understanding that make possible spaces of empowerment for the girls. In particular, the paper argues for a reflexive approach to empowerment that is informed by an understanding of the framing discourses shaping minority student identity and a critical reflection on educator and school positionality.  相似文献   

Supporting minority women and girls: Key frames of reference and understanding for educators     

Amanda Keddie 《British Educational Research Journal》2011,37(1):131-146

Recent high‐profile rape cases in Australia involving Muslim and Indigenous minority groups have heightened contention around issues of culture, gender and justice. The article critically examines the culturalising of rape as an ethnic minority issue in the public and legal discourse associated with these cases. This examination problematises the western‐driven narratives about minority women that undergird and make possible this culturalising and foregrounds Muslim and Indigenous feminist priorities concerning issues of gender equity and justice. Against this backdrop, the article draws parallels between the inferiorising of ethnic minority culture in dominant legal and public discourse and the reductionism of culture in education discourse. Towards realising the equity mandates of national schooling policy, the article outlines key frames of reference and understanding about culture, gender and justice necessary for enhancing educators’ support for ethnic minority women and girls.  相似文献   

Keeping up with the Joneses: Institutional changes following the adoption of a merit aid policy     

Amanda L. Griffith 《Economics of Education Review》2011,30(5):1022-1033

The increasing use by private colleges and universities of financial aid based on “merit”, as opposed to based solely on financial need has caused many to raise concerns that this type of aid will go mainly to higher income students crowding out aid to lower income students. However, some analysts suggest that by attracting more “almost full-paying” students through the use of merit aid, institutions will have more financial resources that they can use to increase their financial aid to low-income students and thus their enrollment. Results using data from the College Board's Annual Survey of Colleges and other secondary data sources suggest that the increased use of merit aid is associated with a decrease in enrollment of low-income and minority students, particularly at more selective institutions. Middle and bottom tier colleges may be offsetting costs with tuition increases, as the introduction of merit aid is accompanied by an increase in net costs.  相似文献   

Gender Gaps in Collegiate Teaching Style: Variations by Course Characteristics     

Thomas F. Nelson Laird  Amy K. Garver  Amanda Suniti Niskodé-Dossett 《Research in higher education》2011,52(3):261-277

Using data from over 9,000 faculty members that participated in the Faculty Survey of Student Engagement (FSSE), this study examined the moderating role a range of course characteristics played on the effects of gender on the percentage of class time spent on various activities, a measure of teaching style. Results revealed gender differences, but that the gaps between men and women in lecturing and active classroom practices varied by disciplinary area, course level, and the number of times a course had been taught by the same instructor. The results confirm that gender effects depend on context, which implies that efforts to improve teaching and learning must also adapt to the instructional context.  相似文献   

The effects of focus of attention and task objective consistency on learning a balancing task     

Jackson BH  Holmes AM 《Research quarterly for exercise and sport》2011,82(3):574-579

  相似文献