148,063 research outputs found
Bias Adjusted Estimation for Small Areas with Outlying Values
No full textSmall area estimation techniques typically rely on regression models that use both covariates and random effects to explain between domain variation. Chambers and Tzavidis (2006) describe a novel approach to small area estimation that is based on modelling quantile-like parameters of the conditional distribution of the target variable given the covariates. This is an outlier robust approach that avoids conventional Gaussian assumptions and the problems associated with specification of random effects, allowing inter-domain differences to be characterized by the variation of area-specific M-quantile coefficients. These authors observed, however, that M-quantile estimates of small area means are biased with the magnitude of the bias being related to the presence of outliers in the data. In this paper we propose a bias adjustment to the M-quantile small area estimator of the mean that is based on representing this estimator as a functional of the small area distribution function. The method is then generalized for estimating other quantiles of the distribution function in a small area. The effect of this bias adjustment on small area estimation with random effects models in the presence of model misspecification is also examined
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Chaetozone (Cirratulidae) from the Mediterranean Sea
No full textMany specimens of Chaetozone have been recorded from the Mediterranean Sea since the
descriptions and figures of the Naples fauna in one of the first comprehensive studies of
polychaetes by delle Chiaje, 1823-30. Since then other species have been recorded from the
Mediterranean eg Chaetozone caputesocis Saint-Joseph, 1894. However, there is confusion
about some of the subsequent records as they are often confused with species from the North
Atlantic eg C.setosa. It has been confirmed that Chaetozone setosa Malmgren, 1867 occurs
in sub-littoral waters of the North Atlantic with minimum summer temperatures of 10
degrees centigrade (Chambers, Dominguez, Mair, Mitchell and Woodham et al 2007). No
records of C.setosa have subsequently been confirmed from the Mediterranean. Recently,
attempts have been made to collect benthic material from a few Mediterranean sites and
describe the samples in some detail. The purpose has been to confirm the distribution of some Chaetozone species
Fordham Letter from Julius LeVonne Chambers
No full textLetter from J. LeVonne Chambers to Jefferson B. Fordham regarding Lakeland Memorial Park discrimination suit
Letter from A.B. Chambers to George Sibley, May 12, 1840
No full textTranscript of Letter from A.B. Chambers to George Sibley, May 12, 1840. Chambers discusses Whig politics in Missouri
Letter from A.B. Chambers to George Sibley, September 25, 1839
No full textTranscript of Letter from A.B. Chambers to George Sibley, September 25, 1839. Chambers discusses sending Sibley Colonel Benton\u27s queries on Solomon Salt; asks for Sibley\u27s opinion
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Radiated Immunity Testing of a Device with an External Wire: Repeatibility of Reverberation Chamber Results and Correlation with Anechoic Chamber Results
No full textWe present the experimental radiated immunity results of an electronic device with an external wire obtained in reverberation and anechoic chambers. Repeatability and reproducibility of reverberation chamber measurements are investigated by repeating the test in three reverberation chambers with different characteristics. We show how the current state of the art allows a statistical control of RC measurement repeatability within an industrial installation, and that a statistical correlation with AC results frequency by frequency is possible in particular cases relevant to automotive application
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