1,721,059 research outputs found
Balanced two-stage equal probability sampling
No full textFor two-stage sampling, equal probability sampling method (epsem) by πps-SRS is commonly used in practice. It also provides practical means for controlling cost and fieldwork allocation. In two-stage epsem, same number of elements are selected by SRS from each sampled PSU. As an alternative to this convention for two-stage epsem, one can also select same number of equal-sized sub-clusters by SRS from each sampled PSU. Furthermore, although HT-estimator is design unbiased, when a set of auxiliary variables is known, generalized regression (or GREG) estimator is also commonly used in practice.A comparison of sampling strategies involving two-stage epsem by πps-SRS may provide a useful insights from practical viewpoint. Therefore, four sampling strategies involving two-stage epsem are compared under a two-level regression model which is a intuitive choice for two-stage sampling. A simulation study is also conducted to support theoretical comparison of the sampling strategies.Cube method for balanced sampling was proposed for selection of PSU’s. In two-stage sampling design, cube method can be used when auxiliary variables are know at either PSU-level or at element level. Cube method aims to selected balanced samples with fixed first-order inclusion probabilities. It consists of two-phases: flight- and landing-phase. When its landing-phase is invoked, samples are not exactly balanced. A sampling procedure is proposed which aims to improve landing-phase of the cube method when it is not exactly balanced. In addition, a methodology for the estimation of sampling variance under balanced sampling is also proposed which found to be better than a variance estimator in literature. Simulation studies are conducted to investigate the performance of proposed sampling procedure and variance estimators.When location data of sampling units is available, it is emphasized in literature to select spatially balanced samples as study variables are expected to have positive spatial autocorrelation. Since there are many spatially balanced sampling methods available, a comparative study of different spatially balanced sampling methods is conducted under a spatial super-population model with varying level of spatial autocorrelation. When both auxiliary and spatial variables are known, doubly balanced sampling is advocated in literature. Spatial or doubly balanced sampling can be used in two-stage samplingdepending on availability of spatial and auxiliary variables. Some variables of the study population may have negative spatial autocorrelation, as two-stage designs are often used for socio-economic surveys which include a variety of study variables. Four spatial sampling schemes are suggested to select spatially balanced samples when there are also some variables with negative spatial autocorrelation in the population. A variance estimation methodology is also suggested under the spatially balanced and doubly balanced sampling methods. Simulation studies are conducted to investigate the performance of proposed spatial sampling schemes and variance estimators
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Tail-Event driven NETwork dependence in emerging markets
No full textThis paper employs the Tail Event NETwork (TENET) to identify financial markets with greater potential risk, and simultaneously investigate the interdependence between them. We find strong time-varying connectedness across 23 emerging markets during the main crisis episodes, including the most recent COVID-19 pandemic, using data from January 1995 to May 2021. The network analysis revealed that emerging European markets are top risk transmitters, whereas emerging Asian markets are top risk receivers. China showed disconnection from the network, reflecting its diversification potential for investors. Our findings offer several policy and regulatory implications
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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