How are we searching the World Wide Web? A comparison of nine search engine transaction logs

The Web and especially major Web search engines are essential tools in the quest to locate online information for many people. This paper reports results from research that examines characteristics and changes in Web searching from nine studies of five Web search engines based in the US and Europe. We compare interactions occurring between users and Web search engines from the perspectives of session length, query length, query complexity, and content viewed among the Web search engines. The results of our research shows (1) users are viewing fewer result pages, (2) searchers on US-based Web search engines use more query operators than searchers on European-based search engines, (3) there are statistically significant differences in the use of Boolean operators and result pages viewed, and (4) one cannot necessary apply results from studies of one particular Web search engine to another Web search engine. The wide spread use of Web search engines, employment of simple queries, and decreased viewing of result pages may have resulted from algorithmic enhancements by Web search engine companies. We discuss the implications of the findings for the development of Web search engines and design of online content.     

DEVELOPING PROBLEM SOLVING SKILLS

Some complex societal problems such as sudden changes in Eastern Europe or the problem of AIDS are very hard to handle. Even defining the problem is difficult. Managers and experts often lack the knowledge and training to handle these kinds of problem, although the problems require intensive effort. Education typically offers few opportunities for learning how to handle them. Research on Artificial Intelligence mostly focuses on problems in stable situations which have already been solved, and ignores as yet unsolved problems in rapidly changing situations. Before a problem can be solved, it has to be defined: System dynamic modelling can be a powerful tool for doing this. Defining the kind of problem discussed here also requires teamwork: Managers and experts can learn to define a complex problem in a special learning environment involving cases embedded in free form games.     

Evaluating the performance of demographic targeting using gender in sponsored search

In this research, we evaluate the effect of gender targeted advertising on the performance of sponsored search advertising. We analyze nearly 7,000,000 records spanning 33 consecutive months of a keyword advertising campaign from a major US retailer. In order to determine the effect of demographic targeting, we classify the campaign’s key phrases by a probability of being targeted for a specific gender, and we then compare the key performance indicators among these groupings using the critical sponsored search metrics of impressions, clicks, cost-per-click, sales revenue, orders, and items, and return on advertising. Findings from our research show that the gender-orientation of the key phrase is a significant determinant in predicting behaviors and performance, with statistically different consumer behaviors for all attributes as the probability of a male or female keyword phrase changes. However, gender neutral phrases perform the best overall, generating 20 times the return of advertising than any gender targeted category. Insight from this research could result in sponsored advertising efforts being more effectively targeted to searchers and potential consumers.     

Deepening Understanding of Science and Mathematics Education Reform Principles: Novice Teachers Design Web-based Units Using Project 2061's Curriculum Analysis

Journal of Science Teacher Education -     

The relative efficiency of charter schools: A cost frontier approach

Charters represent an expansion of public school choice, offering free, publicly funded educational alternatives to traditional public schools. One relatively unexplored research question concerning charter schools asks whether charter schools are more efficient suppliers of educational services than are traditional public schools. The potential relative efficiency advantage of charters vis-a-vis traditional publics is one of the mechanisms that supports the hypotheses that charters could improve performance for their students while using the same or fewer resources, and that the systemic effect of charters could lead to improved outcomes for traditional public students without requiring an increase in education sector resources.     

Time series analysis of a Web search engine transaction log

In this paper, we use time series analysis to evaluate predictive scenarios using search engine transactional logs. Our goal is to develop models for the analysis of searchers’ behaviors over time and investigate if time series analysis is a valid method for predicting relationships between searcher actions. Time series analysis is a method often used to understand the underlying characteristics of temporal data in order to make forecasts. In this study, we used a Web search engine transactional log and time series analysis to investigate users’ actions. We conducted our analysis in two phases. In the initial phase, we employed a basic analysis and found that 10% of searchers clicked on sponsored links. However, from 22:00 to 24:00, searchers almost exclusively clicked on the organic links, with almost no clicks on sponsored links. In the second and more extensive phase, we used a one-step prediction time series analysis method along with a transfer function method. The period rarely affects navigational and transactional queries, while rates for transactional queries vary during different periods. Our results show that the average length of a searcher session is approximately 2.9 interactions and that this average is consistent across time periods. Most importantly, our findings shows that searchers who submit the shortest queries (i.e., in number of terms) click on highest ranked results. We discuss implications, including predictive value, and future research.     

Impact of Overt and Subclinical Hypothyroidism on Exercise Tolerance: A Systematic Review

Purpose: This systematic review describes the state of the art of the impact of hypothyroidism on exercise tolerance and physical performance capacity in untreated and treated patients with hypothyroidism. Method: A systematic computer-aided search was conducted using biomedical databases. Relevant studies in English, German, and Dutch, published from the earliest date of each database up to December 2012, were identified. Results: Out of 116 studies, a total of 38 studies with 1,379 patients fulfilled the inclusion criteria. These studies emphasize the multifactorial causes of exercise intolerance in untreated patients by the impact of limitations in different functional systems, with cardiovascular, cardiopulmonary, musculoskeletal, neuromuscular, and cellular metabolic systems acting in concert. Moreover, the studies affirm that exercise intolerance in patients is not always reversible during adequate hormone replacement therapy. As a consequence, despite a defined euthyroid status, there remains a significant group of treated patients with persistent complaints related to exercise intolerance who are suffering from limitations in daily and sport activities, as well as an impaired quality of life. An explanation for this phenomenon is lacking. Only 2 studies investigated the effects of a physical training program, and they showed inconsistent effects on the performance capacity in untreated patients with subclinical hypothyroidism. Conclusions: A limited body of knowledge exists concerning exercise tolerance in treated patients with hypothyroidism, and there is an insufficient amount of quantitative studies on the effects of a physical training program. To enhance exercise and sports participation for this specific group, more research in this forgotten area is warranted.     

How is the approach to teaching at secondary school related to first-year university achievement?

The study presented here is an elaboration on recent educational effectiveness research focusing on long-term school effects. Central in this study is the approach to teaching at secondary schools and its relation to student perception of the fit between school and university and 1st-year academic achievement. Based on previous research, a coding scheme is developed to classify pre-university schools based on the approach to teaching in the upper 3 years. Schools are scored according to this coding scheme and grouped with hierarchical cluster analysis, resulting in 3 groups: 1 characterized by a strong teacher-regulation approach, 1 with a shared regulation approach to learning, and 1 intermediate group. Multiple analysis of covariance shows differences between school clusters regarding student 1st-year achievement in soft science programmes.     

The Development of Metacognition in Primary School Learning Environments

Constructivist ideas have influenced recent major innovations in Dutch secondary education and new curricula for reading and math in primary education, for example, pay much more attention to metacognition than before. In our study, we compared the growth of student metacognition in varying learning environments, direct instruction, and cognitive apprenticeship in primary school. The study also included a control group of teachers. In order to measure metacognition we developed a questionnaire, with separate parts for metacognitive skills and metacognitive knowledge. In the item selection procedure we made use of item response modeling. It was found that in the direct instruction and the cognitive apprenticeship group the pupils had higher scores on metacognitive skills and metacognitive knowledge compared to the control group pupils. No clear differences were found between direct instruction and cognitive apprenticeship. Interactions of learning environment and student intelligence were non-significant for both output measures.     

In search of the excellent literature teacher. An inductive approach to constructing professional teaching standards

This study makes a contribution to the development of empirically based, domain-specific teaching standards that are acknowledged by the professional community of teachers and which, therefore, have a good chance of being successfully implemented and used for professional development purposes. It was prompted by the resistance on the part of many teachers to the one-size-fits-all teaching standards imposed on them from above. We, therefore, looked for an alternative and canvassed teacher opinion about what makes an excellent literature teacher. Because our standards will be used to evaluate the profession, we also wished to know to what extent teachers satisfy (or would like to satisfy) their own ideal, and which factors influence their professional development. Contrary to earlier studies, we found that the professional community of literature teachers hold widely shared ideas about what constitutes excellence in their profession. We also found that almost 40% felt that their own level of professionalism fell far short of excellence, but that their professional growth was primarily hampered by external, contextual factors. If the government wishes to promote teacher ‘excellence’, the infrastructure for professional development will need to change so that teachers can acquire the knowledge and skills embodied in the teaching standards.