8 results on '"DATABASES"'
Search Results
2. Insights from Two Decades of PISA-Related Studies in the New Century: A Systematic Review
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Jia-qi Zheng, Kwok-cheung Cheung, and Pou-seong Sit
- Abstract
Several international large-scale assessments were conducted at the turn of the new century, and during the past two decades the Programme for International Student Assessment (PISA) completed seven cycles of assessment to facilitate practitioners' policy debates and governance. This study reviews PISA-related articles published in English and Chinese. Three literature databases were searched, with a focus on SSCI, CSSCI, and TSSCI journal publications. The frequency of publication was analyzed according to the author's country affiliation, type of journal, and research categories/themes. Findings indicate that research on student-, school- and system-level indicators with a focus on students' learning processes and outcomes as well as critiques of technical matters on PISA were frequent topics in the literature during the past two decades. Issues of equality and equity examined in the publications have implications for enhancing practitioners' capabilities in terms of policy making and governance.
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- 2024
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3. Methods and Procedures in PIRLS 2016
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International Association for the Evaluation of Educational Achievement (IEA) (Netherlands), Boston College, TIMSS & PIRLS International Study Center, Martin, Michael O., Mullis, Ina V. S., Hooper, Martin, Martin, Michael O., Mullis, Ina V. S., Hooper, Martin, International Association for the Evaluation of Educational Achievement (IEA) (Netherlands), and Boston College, TIMSS & PIRLS International Study Center
- Abstract
"Methods and Procedures in PIRLS 2016" documents the development of the Progress in International Reading Literacy Study (PIRLS) assessments and questionnaires and describes the methods used in sampling, translation verification, data collection, database construction, and the construction of the achievement and context questionnaire scales. In particular, "Methods and Procedures" documents the numerous quality assurance steps and procedures implemented by all those involved in the PIRLS 2016 assessments, including the TIMSS & PIRLS International Study Center, IEA Amsterdam and IEA Hamburg, Statistics Canada, and the National Research Coordinators and their teams in the participating countries and benchmarking entities. This report contains four sections and fourteen chapters. Section 1, Instrument Development, contains the following chapters: (1) Developing the PIRLS 2016 Achievement Items (Ina V. S. Mullis and Caroline O. Prendergast); and (2) Developing the PIRLS 2016 Context Questionnaires (Martin Hooper and Bethany Fishbein). Section 2, Sampling, contains the following chapters: (3) Sample Design in PIRLS 2016 (Sylvie LaRoche, Marc Joncas, and Pierre Foy); (4) Estimating Standard Errors in the PIRLS 2016 Results (Pierre Foy and Sylvie LaRoche); and (5) Sample Implementation in PIRLS 2016 (Sylvie LaRoche and Pierre Foy). Section 3, Data Collection Procedures, contains: (6) Survey Operations Procedures in PIRLS 2016 (Ieva Johansone); (7) Translation and Layout Verification for PIRLS 2016 (David Ebbs and Erin Wry); (8) Quality Assurance Program for PIRLS 2016 (Ieva Johansone and Erin Wry); and (9) Creating the PIRLS 2016 International Database (Sebastian Meyer, Mark Cockle, and Milena Taneva). Section 4, Reporting, contains: (10) Reviewing the PIRLS 2016 Achievement Item Statistics (Pierre Foy, Michael O. Martin, Ina V. S. Mullis, and Liqun Yin); (11) PIRLS 2016 Achievement Scaling Methodology; (12) Scaling the PIRLS 2016 Achievement Data (Pierre Foy and Liqun Yin); (13) Using Scale Anchoring to Interpret the PIRLS and ePIRLS 2016 Achievement Scales (Ina V. S. Mullis and Caroline O. Prendergast); and (14) Creating and Interpreting the PIRLS 2016 Context Questionnaire Scales (Michael O. Martin, Ina V. S. Mullis, Martin Hooper, Liqun Yin, Pierre Foy, Bethany Fishbein, and Jenny Liu). [Individual chapters contain references.]
- Published
- 2017
4. Trends in the epidemiology of young-onset colorectal cancer: a worldwide systematic review.
- Author
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El Din, Khalid Saad, Loree, Jonathan M., Sayre, Eric C., Gill, Sharlene, Brown, Carl J., Dau, Hallie, De Vera, Mary A., and Saad El Din, Khalid
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META-analysis , *COLORECTAL cancer , *RANDOM effects model , *EPIDEMIOLOGY , *RECTAL cancer , *DATABASES , *SYSTEMATIC reviews , *DISEASE incidence , *AGE factors in disease , *DISEASE prevalence , *RESEARCH funding - Abstract
Background: Recent data suggest that the risk of young-onset colorectal cancer (yCRC), in adults less than 50 years of age, is increasing. To confirm findings and identify contemporary trends worldwide, we conducted a systematic review of studies examining population-level trends in yCRC epidemiology.Methods: We searched MEDLINE (1946-2018), EMBASE (1974-2018), CINAHL (1982-2018), and Cochrane Database of Systematic Reviews (2005-2018) for studies that used an epidemiologic design, assessed trends in yCRC incidence or prevalence, and published in English. Extracted information included country, age cut-off for yCRC, and reported trends in incidence or prevalence (e.g. annual percent change [APC]). We pooled similarly reported trend estimates using random effects models.Results: Our search yielded 8695 articles and after applying our inclusion criteria, we identified 40 studies from 12 countries across five continents. One study assessed yCRC prevalence trends reporting an APCp of + 2.6 and + 1.8 among 20-39 and 40-49 year olds, respectively. 39 studies assessed trends in yCRC incidence but with substantial variability in reporting. Meta-analysis of the most commonly reported trend estimate yielded a pooled overall APCi of + 1.33 (95% CI, 0.97 to 1.68; p < 0.0001) that is largely driven by findings from North America and Australia. Also contributing to these trends is the increasing risk of rectal cancer as among 14 studies assessing cancer site, nine showed an increased risk of rectal cancer in adults less than 50 years with APCi up to + 4.03 (p < 0.001).Conclusions: Our systematic review highlights increasing yCRC risk in North America and Australia driven by rising rectal cancers in younger adults over the past two decades. [ABSTRACT FROM AUTHOR]- Published
- 2020
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5. Constraining lowermost mantle anisotropy with body waves: a synthetic modelling study.
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Creasy, Neala, Pisconti, Angelo, Long, Maureen D, Thomas, Christine, and Wookey, James
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SEISMIC anisotropy , *SHEAR waves , *PHYSICS literature , *PHYSICS , *DATABASES - Abstract
Different mechanisms have been proposed as explanations for seismic anisotropy at the base of the mantle, including crystallographic preferred orientation of various minerals (bridgmanite, post-perovskite and ferropericlase) and shape preferred orientation of elastically distinct materials such as partial melt. Investigations of the mechanism for D" anisotropy usually yield ambiguous results, as seismic observations rarely (if ever) uniquely constrain a mechanism or orientation and usually rely on significant assumptions to infer flow patterns in the deep mantle. Observations of shear wave splitting and polarities of SdS and PdP reflections off the D" discontinuity are among our best tools for probing D" anisotropy; however, currently available data sets cannot constrain one unique scenario among those suggested by the mineral physics literature. In this work, we determine via a forward modelling approach what combinations of body wave phases (e.g. SKS, SKKS and ScS) are required to uniquely constrain a mechanism for D" anisotropy. We test nine models based on single-crystal and polycrystalline elastic tensors provided by mineral physics studies. Our modelling predicts fast shear wave splitting directions for SKS, SKKS and ScS phases, as well as polarities of P- and S- wave reflections off the D" interface, for a range of propagation directions, via solution of the Christoffel equation. We run tests using randomly selected synthetic data sets based on a given starting model, controlling the total number of measurements, the azimuthal distribution, and the type of seismic phases. For each synthetic data set, we search over all possible elastic tensors and orientations to determine which are consistent with the synthetic data. Overall, we find it difficult to uniquely constrain the mechanism for anisotropy with a typical number of seismic anisotropy measurements (based on currently available studies) with only one measurement technique (SKS, SKKS, ScS or reflection polarities). However, data sets that include SKS, SKKS and ScS measurements or a combination of shear wave splitting and reflection polarity measurements increase the probability of uniquely constraining the starting model and its orientation. Based on these findings, we identify specific regions (i.e. North America, northwestern Pacific and Australia) of the lowermost mantle with sufficient ray path coverage for a combination of measurement techniques. [ABSTRACT FROM AUTHOR]
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- 2019
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6. Responsiveness to Erythropoiesis-Stimulating Agents in Chronic Kidney Disease: Does Geography Matter?
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De Nicola, Luca, Locatelli, Francesco, Conte, Giuseppe, and Minutolo, Roberto
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ANEMIA , *CONFIDENCE intervals , *DATABASES , *ERYTHROPOIESIS , *META-analysis , *MULTIVARIATE analysis , *POPULATION geography , *SYSTEMATIC reviews , *PROPORTIONAL hazards models , *KAPLAN-Meier estimator ,CHRONIC kidney failure complications - Abstract
Management of renal anemia in the large and at-risk population of non-dialysis chronic kidney disease (CKD) patients is a critical issue. In particular, definition of the optimal hemoglobin (Hb) target for therapy is controversial but highly warranted by physicians and patients worldwide. Recently, international clinical practice guidelines have recommended delayed initiation of erythropoiesis-stimulating agents (ESA) and lower Hb target levels during maintenance therapy. However, geographical differences in terms of ESA dose needed to achieve a given Hb value can be evidenced, with US patients showing higher prevalence of ESA resistance. On the other hand, non-US patients are often maintained in a higher Hb range by means of low ESA doses. This critical point has never been addressed. Nevertheless, outside of the US, translating the restrictive recommendations of new guidelines, which are essentially based on trials in US patients, can lead to negative effects, such as an increased need for a blood transfusion, and worsening of quality of life. In this article we provide a reappraisal of current recommendations on anemia management in non-dialysis CKD in light of the geographical differences in individual responsiveness to ESA. [ABSTRACT FROM AUTHOR]
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- 2014
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7. Pollutant loads from coal mining in Australia: Discerning trends from the National Pollutant Inventory (NPI).
- Author
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Weng, Zhehan, Mudd, Gavin M., Martin, Timothy, and Boyle, Carol A.
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POLLUTANTS ,COAL mining ,ENVIRONMENTAL impact analysis ,ENVIRONMENTAL regulations ,PUBLIC health ,DATABASES - Abstract
Abstract: A key environmental concern is pollution loads released from human activity, since excessive pollutant loads can cause significant public health and/or environmental impacts. A principal objective of environmental regulation is therefore to minimise pollutant releases. The most common approach to assessing and monitoring pollutant loads is through pollutant release databases, with such systems now operating throughout Europe, North America and Australia. This paper has compiled and analysed an extensive data set on Australian coal mining and associated pollutant emissions reported through the National Pollutant Inventory (NPI). In Australia, the coal industry has been growing rapidly over recent decades, and this is causing significant community concerns over cumulative environmental impacts. The pollutant loads and intensities from coal mining are analysed in conjunction with production data. The trends identified in this paper provide an important basis to understand the value of pollutant release and transfer registers, such as the NPI, and demonstrate the critical need to integrate such data with ongoing trends in industry and environmental management initiatives. [Copyright &y& Elsevier]
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- 2012
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8. The International Soil Moisture Network: a data hosting facility for global in situ soil moisture measurements.
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Dorigo, W. A., Wagner, W., Hohensinn, R., Hahn, S., Paulik, C., Xaver, A., Gruber, A., Drusch, M., Mecklenburg, S., van Oevelen, P., Robock, A., and Jackson, T.
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SOIL moisture ,WATER bikes ,CLIMATE change ,LAND cover ,METEOROLOGICAL precipitation ,SOIL temperature ,METEOROLOGICAL stations ,DATABASES ,GRAPHICAL user interfaces - Abstract
In situ measurements of soil moisture are invaluable for calibrating and validating land surface models and satellite-based soil moisture retrievals. In addition, long-term time series of in situ soil moisture measurements themselves can reveal trends in the water cycle related to climate or land cover change. Nevertheless, on a worldwide basis the number of meteorological networks and stations measuring soil moisture, in particular on a continuous basis, is still limited and the data they provide lack standardization of technique and protocol. To overcome many of these limitations, the International Soil Moisture Network (ISMN; http://www.ipf.tuwien.ac.at/insitu) was initiated to serve as a centralized data hosting facility where globally available in situ soil moisture measurements from operational networks and validation campaigns are collected, harmonized, and made available to users. Data collecting networks share their soil moisture datasets with the ISMN on a voluntary and no-cost basis. Incoming soil moisture data are automatically transformed into common volumetric soil moisture units and checked for outliers and implausible values. Apart from soil water measurements from different depths, important metadata and meteorological variables (e.g., precipitation and soil temperature) are stored in the database. These will assist the user in correctly interpreting the soil moisture data. The database is queried through a graphical user interface while output of data selected for download is provided according to common standards for data and metadata. Currently (status May 2011), the ISMN contains data of 19 networks and more than 500 stations located in North America, Europe, Asia, and Australia. The time period spanned by the entire database runs from 1952 until the present, although most datasets have originated during the last decade. The database is rapidly expanding, which means that both the number of stations and the time period covered by the existing stations are still growing. Hence, it will become an increasingly important resource for validating and improving satellite-derived soil moisture products and studying climate related trends. As the ISMN is animated by the scientific community itself, we invite potential networks to enrich the collection by sharing their in situ soil moisture data. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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