scholarly journals THE USE OF STATISTICAL ANALYSIS IN THE LITHOSTRATIGRAPHY OF SUBMARINE FAN DEPOSITS. AN EXAMPLE FROM SOUTHEAST GREECE (KARPATHOS ISLAND)

2006 ◽  
Vol 39 (1) ◽  
pp. 100
Author(s):  
G. Pantopoulos ◽  
P. Konstantopoulos ◽  
A. Maravelis ◽  
A. Zelilidis
Keyword(s):  
Statistical Analysis ◽  
Power Law ◽  
Late Eocene ◽  
Hydrocarbon Exploration ◽  
Source Information ◽  
Submarine Fan ◽  
Submarine Fans ◽  
The Past ◽  
Bed Thickness ◽  
Turbidite Sedimentation

Examples of various types of statistical analysis of submarine fan bed thickness distributions that have been proposed in the past are reported, as well as an example of their application in Late Eocene-Oligocene submarine fan deposits of SE Greece (Karpathos Island). Generally, the sandstone bed thickness data measured in two outcrops of Karpathos submarine fans seems to follow power law (fractal) cumulative distributions. A deviation from the power law was observed as amalgamationprocedures become more frequent. These observations gave important information about Tertiary turbidite sedimentation in the area which probably was punctuated and had a single main sediment source. Information taken from statistical analysis of submarine fans bed thickness data has immediate applicability in hydrocarbon exploration because sandstones constitute ideal reservoirs.

scholarly journals APPLICATION OF BED THICKNESS DISTRIBUTIONS IN TURBIDITE DEPOSITS OF LEMNOS ISLAND, NE GREECE

2018 ◽  
Vol 40 (1) ◽  
pp. 154
Author(s):  
A. Maravelis ◽  
P. Konstantopoulos ◽  
G. Pantopoulos ◽  
A. Zelilidis
Keyword(s):  
Frequency Distribution ◽  
Power Law ◽  
Thickness Distribution ◽  
Late Eocene ◽  
Cumulative Frequency ◽  
Cumulative Frequency Distribution ◽  
Submarine Fan ◽  
Early Oligocene ◽  
Power Law Exponent ◽  
Bed Thickness

The submarine fan deposits in Lemnos Island, of the NE Greece provide a perfect opportunity to investigate the influence of processes such as erosion and bed amalgamation in the alternation of the shape of a power-law cumulative frequency distribution. The bed thickness distribution in two outcrops of late Eocene to early Oligocene turbidite deposits that correspond to different sub-environment, has been assessed statistically. Sediments of the outcrop 1 at the SE parts of the Lemnos Island interpreted as outer fan deposits and sediments of the outcrop 2 located at the NE parts of the island as inner fan deposits show both a good fit to the power-law, amplifying the hypothesis that departures from power-law statistics might be used as evidence of erosion and bed amalgamation. The main difference between these two outcrops is that the power law exponent decreases abruptly from outcrop 1 to outcrop 2, confirming with the aspect that the power law exponent can be considered as a good indicator for the available sedimentary space.

Houses of cards

2001 ◽  
Vol 14 ◽  
pp. 56-57 ◽  
Author(s):  
Bettina Bergmann
Keyword(s):  
Statistical Analysis ◽  
Domestic Space ◽  
Behavioral Patterns ◽  
Ad Hominem ◽  
The Past ◽  
Recent Scholarship ◽  
New Information ◽  
Exciting Time

We have reached an important moment in the study of the Roman house. The past 20 years have been extremely active, with scholars approaching domestic space down different disciplinary and methodological avenues. Since the important essay on Campanian houses by A. Wallace-Hadrill in 1988, new excavations and scores of books and articles have changed the picture of Pompeii and, with it, that of the Roman house. Theoretical archaeologists have taken the lead, approaching Pompeii as an "archaeological laboratory" in which, armed with the interpretative tools of spatial and statistical analysis, they attempt to recover ancient behavioral patterns. The interdisciplinary picture that emerges is complex and inevitably contradictory. There is so much new information and such a tangle of perspectives that it is time to consider what we have learned and what kinds of interpretative tools we might best employ. Without doubt this is an exciting time in Roman studies. But two overviews of recent scholarship to appear this year, the present one by R. Tybout and another by P. Allison (AJA 105.2 [2001]), express considerable frustration and resort to ad hominem recriminations that signal a heated backlash, at least among some.

Statistics and Economic History

1941 ◽  
Vol 1 (1) ◽  
pp. 26-41 ◽  
Author(s):  
Simon Kuznets
Keyword(s):  
Statistical Analysis ◽  
Economic History ◽  
Raw Materials ◽  
The Other ◽  
Economic Study ◽  
Statistical Research ◽  
Historical Approach ◽  
The Past ◽  
Economic Inquiry ◽  
Analytical Tools

This paper deals with the relation between statistical analysis as applied in economic inquiry and history as written or interpreted by economic historians. Although both these branches of economic study derive from the same body of raw materials of inquiry—the recordable past and present of economic society—each has developed in comparative isolation from the other. Statistical economists have failed to utilize adequately the contributions that economic historians have made to our knowledge of the past; and historians have rarely employed either the analytical tools or the basic theoretical hypotheses of statistical research. It is the thesis of this essay that such failure to effect a close interrelation between historical approach and statistical analysis needs to be corrected in the light of the final goal of economic study.

scholarly journals Encrypted Databases for Differential Privacy

2019 ◽  
Vol 2019 (3) ◽  
pp. 170-190
Author(s):  
Archita Agarwal ◽  
Maurice Herlihy ◽  
Seny Kamara ◽  
Tarik Moataz
Keyword(s):  
Statistical Analysis ◽  
Real World ◽  
Building Block ◽  
Differential Privacy ◽  
Statistical Databases ◽  
The Past ◽  
Statistical Queries ◽  
Encrypted Database

Abstract The problem of privatizing statistical databases is a well-studied topic that has culminated with the notion of differential privacy. The complementary problem of securing these differentially private databases, however, has—as far as we know—not been considered in the past. While the security of private databases is in theory orthogonal to the problem of private statistical analysis (e.g., in the central model of differential privacy the curator is trusted) the recent real-world deployments of differentially-private systems suggest that it will become a problem of increasing importance. In this work, we consider the problem of designing encrypted databases (EDB) that support differentially-private statistical queries. More precisely, these EDBs should support a set of encrypted operations with which a curator can securely query and manage its data, and a set of private operations with which an analyst can privately analyze the data. Using such an EDB, a curator can securely outsource its database to an untrusted server (e.g., on-premise or in the cloud) while still allowing an analyst to privately query it. We show how to design an EDB that supports private histogram queries. As a building block, we introduce a differentially-private encrypted counter based on the binary mechanism of Chan et al. (ICALP, 2010). We then carefully combine multiple instances of this counter with a standard encrypted database scheme to support differentially-private histogram queries.

LONG RANGE CORRELATION PROPERTIES OF AFTERSHOCK RELAXATION SIGNALS

Fractals ◽  
1995 ◽  
Vol 03 (04) ◽  
pp. 839-847 ◽  
Author(s):  
A. VESPIGNANI ◽  
A. PETRI ◽  
A. ALIPPI ◽  
G. PAPARO ◽  
M. COSTANTINI
Keyword(s):  
Time Series ◽  
Acoustic Emission ◽  
Statistical Analysis ◽  
Power Spectrum ◽  
Power Law ◽  
Amplitude Distribution ◽  
Relaxation Processes ◽  
Critical Dynamics ◽  
Range Correlation ◽  
Correlation Properties

Relaxation processes taking place after microfracturing of laboratory samples give rise to ultrasonic acoustic emission signals. Statistical analysis of the resulting time series has revealed many features which are characteristic of critical phenomena. In particular, the autocorrelation functions obey a power-law behavior, implying a power spectrum of the kind 1/f. Also the amplitude distribution N(V) of such signals follows a power law, and the obtained exponents are consistent with those found in other experiments: N(V) dV≃V–γ dV, with γ=1.7±0.2. We also analyzed the distribution N(τ) of the delay time τ between two consecutive acoustic emission events. We found that a N(τ) distribution rather close to a power law constitutes a common feature of all the recorded signals. These experimental results can be considered as a striking evidence for a critical dynamics underlying the microfracturing processes.

Is Homeopathy More Effective Now Than a Hundred Years Ago?

2021 ◽  
Vol 34 (02) ◽  
pp. 123-129
Author(s):  
Lex Rutten ◽  
Raj Kumar Manchanda ◽  
José Eizayaga
Keyword(s):  
Statistical Analysis ◽  
Data Management ◽  
Effective Treatment ◽  
Past Century ◽  
Scientific Level ◽  
Amount Of Information ◽  
The Past ◽  
Treatment Data ◽  
Management Techniques ◽  
Systematic Collection

AbstractDuring the past century, the amount of information about homeopathic medicines has grown dramatically. However, the recent coronavirus disease 2019 pandemic has shown that homeopathic practitioners do not use more medicines than a century ago and they seem to use less symptoms to find the proper medicine. This could be explained by the fact that the more than a hundred years old repertory was flawed from the beginning and that more information in the repertory leads the practitioner astray in an increasingly complex labyrinth of data.This can be resolved by applying modern data management techniques based on systematic collection of treatment data and statistical analysis of the data. Homeopathic practitioners should collect these data avoiding bias. This requires additional training of practitioners, which should also result in a higher scientific level of homeopathic practice and increasingly effective treatment as the database grows.

scholarly journals Application of the Fractal Method to the Characterization of Organic Heterogeneities in Shales and Exploration Evaluation of Shale Oil

2019 ◽  
Vol 7 (4) ◽  
pp. 88 ◽  
Author(s):  
Bo Liu ◽  
Liangwen Yao ◽  
Xiaofei Fu ◽  
Bo He ◽  
Longhui Bai
Keyword(s):  
Organic Matter ◽  
Vertical Distribution ◽  
Power Law ◽  
Hurst Exponent ◽  
Hydrocarbon Exploration ◽  
Source Rocks ◽  
Organic Carbon Content ◽  
Shale Oil ◽  
Box Counting Dimension ◽  
The Vertical Distribution

The first member of the Qingshankou Formation, in the Gulong Sag in the northern part of the Songliao Basin, has become an important target for unconventional hydrocarbon exploration. The organic-rich shale within this formation not only provides favorable hydrocarbon source rocks for conventional reservoirs, but also has excellent potential for shale oil exploration due to its thickness, abundant organic matter, the overall mature oil generation state, high hydrocarbon retention, and commonly existing overpressure. Geochemical analyses of the total organic carbon content (TOC) and rock pyrolysis evaluation (Rock-Eval) have allowed for the quantitative evaluation of the organic matter in the shale. However, the organic matter exhibits a highly heterogeneous spatial distribution and its magnitude varies even at the millimeter scale. In addition, quantification of the TOC distribution is significant to the evaluation of shale reservoirs and the estimation of shale oil resources. In this study, well log data was calibrated using the measured TOC of core samples collected from 11 boreholes in the study area; the continuous TOC distribution within the target zone was obtained using the △logR method; the organic heterogeneity of the shale was characterized using multiple fractal models, including the box-counting dimension (Bd), the power law, and the Hurst exponent models. According to the fractal dimension (D) calculation, the vertical distribution of the TOC was extremely homogeneous. The power law calculation indicates that the vertical distribution of the TOC in the first member of the Qingshankou Formation is multi-fractal and highly heterogeneous. The Hurst exponent varies between 0.23 and 0.49. The lower values indicate higher continuity and enrichment of organic matter, while the higher values suggest a more heterogeneous organic matter distribution. Using the average TOC, coefficient of variation (CV), Bd, D, inflection point, and the Hurst exponent as independent variables, the interpolation prediction method was used to evaluate the exploration potential of the study area. The results indicate that the areas containing boreholes B, C, D, F, and I in the western part of the Gulong Sag are the most promising potential exploration areas. In conclusion, the findings of this study are of significant value in predicting favorable exploration zones for unconventional reservoirs.

Female Authorship in Radiology: Trends in the Past Decade in CARJ

2020 ◽  
pp. 084653712094664
Author(s):  
Nicole Li ◽  
Mostafa Alabousi ◽  
Michael N. Patlas
Keyword(s):  
Logistic Regression ◽  
Statistical Analysis ◽  
P Value ◽  
Inclusion Criteria ◽  
Odds Ratios ◽  
The Past ◽  
Single Author ◽  
Canadian Association ◽  
Female Authorship ◽  
Over Time

Purpose: To identify trends in female authorship in the Canadian Association of Radiologists Journal (CARJ) from 2010 to 2019. Methods: We retrieved papers published in the CARJ over a 10-year period, and retrospectively reviewed 602 articles. All articles except editorials and advertisements were included. We categorized the names of the first and last position authors as female or male and excluded articles that had at least one author of which gender was not known. We compared the trends in the first and last position authors of the articles from 2010 to 2019. For statistical analysis, logistic regression was performed with reported odds ratios (ORs), and a P value of <.05 was defined as statistically significant. Results: Five hundred thirteen articles met inclusion criteria. Among them, 23 articles with a single author were classified as having only a first author. 39.8% (204/513) of first authors were female and 26.9% (132/490) of last authors were female. There has been an overall temporal increase in the odds of both the first and last author being female in CARJ publications (OR: 1.11, P = .034). Similarly, the odds a CARJ publication’s first author being female increased over time (OR: 1.07, P = .033). Female last author did not predict female first author (OR: 1.48, P = .056). There was no association identified between female last author and year of publication (OR: 1.04, P = .225). Conclusion: There has been an overall increase in engagement of female authorship in CARJ.

Industrial Conflicts: A Statistical Analysis

1992 ◽  
Vol 17 (3) ◽  
pp. 11-26
Author(s):  
Pramod Verma ◽  
K Kumar
Keyword(s):  
Statistical Analysis ◽  
The Past ◽  
Emerging Trends

What are the distinct trends and patterns of industrial conflicts in India in the past two decades? This article by Verma and Kumar addresses this issue and discusses the emerging trends based on an analysis of considerable data.

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