STATISTICAL ANALYSIS OF DIPMETER LOGS FROM EXPLORATION WELLS IN THE DRAVA DEPRESSION, NORTHERN CROATIA

2012 ◽  
Vol 35 (4) ◽  
pp. 343-356 ◽  
Author(s):  
J. Velic ◽  
T. Malvic ◽  
M. Cvetkovic ◽  
M. Bošnjak
Keyword(s):  
Statistical Analysis ◽  
Northern Croatia

LONGITUDINAL EVALUATION OF THE ANTI-NUCLEOCAPSID IGG AFTER THE CONFIRMED COVID-19 IN NORTHERN CROATIAN POPULATION

2021 ◽  
pp. 55-58
Author(s):  
Tamara Bezek ◽  
Petra Meliš ◽  
Bojana Kranjčec ◽  
Snježana Semenski ◽  
Kornelija Klenkar ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Antibody Response ◽  
Grey Zone ◽  
Antibody Testing ◽  
Blood Samples ◽  
N Protein ◽  
Symptomatic Disease ◽  
Blood Specimens ◽  
Northern Croatia ◽  
Time Point

BACKGROUND: This study longitudinally evaluated the IgG response against the N-protein after the onset of COVID19 infection. We determined the kinetics and magnitude of the antibody response against SARS-CoV-2 in conrmed COVID-19 patients who were the rst infected with SARS-CoV-2 in Krapina-Zagorje county in northern Croatia. MATERIALS AND METHODS: We studied 177 blood specimens from 51 patients who tested positive by PCR for COVID-19 and provided longitudinal blood samples over a duration of several months, allowing to evaluate the IgG response against the N-protein. SARS-CoV-2 IgG assay was interpreted as positive (ratio1.4 S/C) or negative (ratio<1.4 S/C). RESULTS: The majority of subjects (48/51) reported symptomatic disease. Among the 49 patients who underwent serological antibody testing at rst time point (median: 47 days), 47/49 were positive for IgG 6.02 (0.24-10.54 S/C), while at sixth time point (median: 275 days) 4/16 patients were positive for IgG, 9/16 were in grey zone, and 3/16 were negative. Using Wilcoxon statistical analysis we found statistically signicant decrease of SARS-CoV-2 N-protein IgG indices between the rst and the sixth time point (median signal to cut-off ratio, S/C, 8.18 IQR 6.91, 9.51 to 0.94 IQR 0.56, 1.18, P=0.001). CONCLUSIONS: We claried the kinetics and magnitude of the antibody response against SARS-CoV-2 in conrmed COVID-19 patients. Our results provide critical evidence that N-protein IgG response persists in the majority of patients for at least six to eight months after COVID19 infection.

Statistical analysis of classification

1966 ◽  
Vol 24 ◽  
pp. 188-189
Author(s):  
T. J. Deeming
Keyword(s):  
Multivariate Analysis ◽  
Statistical Analysis ◽  
Classification Scheme ◽  
Analytical Procedure ◽  
Narrow Band ◽  
Scientific Research ◽  
Maximum Amount ◽  
Amount Of Information

If we make a set of measurements, such as narrow-band or multicolour photo-electric measurements, which are designed to improve a scheme of classification, and in particular if they are designed to extend the number of dimensions of classification, i.e. the number of classification parameters, then some important problems of analytical procedure arise. First, it is important not to reproduce the errors of the classification scheme which we are trying to improve. Second, when trying to extend the number of dimensions of classification we have little or nothing with which to test the validity of the new parameters.Problems similar to these have occurred in other areas of scientific research (notably psychology and education) and the branch of Statistics called Multivariate Analysis has been developed to deal with them. The techniques of this subject are largely unknown to astronomers, but, if carefully applied, they should at the very least ensure that the astronomer gets the maximum amount of information out of his data and does not waste his time looking for information which is not there. More optimistically, these techniques are potentially capable of indicating the number of classification parameters necessary and giving specific formulas for computing them, as well as pinpointing those particular measurements which are most crucial for determining the classification parameters.

Quantitative parallel EELS spectrum imaging developed as a new tool in AEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1202-1203
Author(s):  
Gianluigi Botton ◽  
Gilles L'espérance
Keyword(s):  
Statistical Analysis ◽  
Spatial Resolution ◽  
Personal Computer ◽  
Systematic Study ◽  
Present Author ◽  
Chemical Elements ◽  
Detection Limits ◽  
Research Groups ◽  
Quantitative Performance ◽  
Spectrum Imaging

As interest for parallel EELS spectrum imaging grows in laboratories equipped with commercial spectrometers, different approaches were used in recent years by a few research groups in the development of the technique of spectrum imaging as reported in the literature. Either by controlling, with a personal computer both the microsope and the spectrometer or using more powerful workstations interfaced to conventional multichannel analysers with commercially available programs to control the microscope and the spectrometer, spectrum images can now be obtained. Work on the limits of the technique, in terms of the quantitative performance was reported, however, by the present author where a systematic study of artifacts detection limits, statistical errors as a function of desired spatial resolution and range of chemical elements to be studied in a map was carried out The aim of the present paper is to show an application of quantitative parallel EELS spectrum imaging where statistical analysis is performed at each pixel and interpretation is carried out using criteria established from the statistical analysis and variations in composition are analyzed with the help of information retreived from t/γ maps so that artifacts are avoided.

Intraindividual Variability in Development Within and Between Individuals

2001 ◽  
Vol 6 (3) ◽  
pp. 187-193 ◽  
Author(s):  
John R. Nesselroade
Keyword(s):  
Statistical Analysis ◽  
Research Design ◽  
Intraindividual Variability ◽  
Factor Analytic

A focus on the study of development and other kinds of changes in the whole individual has been one of the hallmarks of research by Magnusson and his colleagues. A number of different approaches emphasize this individual focus in their respective ways. This presentation focuses on intraindividual variability stemming from Cattell's P-technique factor analytic proposals, making several refinements to make it more tractable from a research design standpoint and more appropriate from a statistical analysis perspective. The associated methods make it possible to study intraindividual variability both within and between individuals. An empirical example is used to illustrate the procedure.

Review of Basic FORTRAN for Statistical Analysis.

1967 ◽  
Vol 12 (9) ◽  
pp. 467-467
Author(s):  
JOHN C. LOEHLIN
Keyword(s):  
Statistical Analysis
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