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1

Identifying clusters in Czekanowski's diagram

Bartoszek Krzysztof, Luo Ying

Mathematica Applicanda

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2023

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Vol. 51, no. 2

183--198

EN

Visualizing data through Czekanowski's diagram has as its aim to present how objects are related to each other. Often, obvious clusters of observations are directly visible. However, exactly delimiting them is not a straightforward task. We present here a development of the RMaCzek package that includes cluster identification in Czekanowski's diagrams.

PL

Diagram Czekanowskiego ma na celu zaprezentowanie podobieństw wewnątrz próbki statystycznej. Najczęściej widać na nim wyraźne grupowania elementów. Jednakże dokładne wyznaczenie granic między skupieniami nie jest trywialnym zagdnieniem. W niniejszej pracy przedstawiamy rozszerzoną wersję pakietu RMaCzek, która pozwala na analizę skupień w diagramach Czekanowskiego.

2

A script-driven approach to mapping satellite-derived topography and gravity data over the Zagros Fold-and-Thrust Belt, Iran

Lemenkova Polina

Artificial Satellites : Journal of Planetary Geodesy

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2022

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Vol. 57, No. 2

110--137

EN

Integrated geophysical mapping benefits from visualizing multi-source datasets including gravity and satellite altimetry data using 2D and 3D techniques. Applying scripting cartographic approach by R language and GMT supported by traditional mapping in QGIS is presented in this paper with a case study of Iranian geomorphology and a special focus on Zagros Fold-and-Thrust Belt, a unique landform of the country affected by complex geodynamic structure. Several modules of GMT and ’tmap’ and ’raster’ packages of R language were shown to illustrate the efficiency of the console-based mapping by scripts. Data sources included high-resolution raster grids of GEBCO/SRTM, EGM-2008, SRTM DEM and vector geologic layers of USGS. The cartographic objective was to visualize thematic maps of Iran: topography, geology, satellite-derived gravity anomalies, geoid undulations and geomorphology. Various cartographic techniques were applied to plot the geophysical and topographic field gradients and categorical variations in geological structures and relief along the Zagros Fold-and-Thrust Belt. The structures of Elburz, Zagros, Kopet Dag and Makran slopes, Dasht-e Kavir, Dasht-e Lut and Great Salt Desert were visualized using 3D-and 2D techniques. The geomorphometric properties (slope, aspect, hillshade, elevations) were modelled by R. The study presented a series of 11 new maps made using a combination of scripting techniques and GIS for comparative geological-geophysical analysis. Listings of R and GMT scripting are provided for repeatability.

3

The role of word and n-gram frequency analysis in inference of the content of scientific publication

Zdonek Iwona

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2020

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z. 142

21--31

EN

Purpose: The paper presents an analysis of a scientific publication with regard to the frequency of words and n-grams. The research problem addressed was the question to what extent the text mining analysis of a scientific publication will allow to infer its content. Design/methodology/approach: The main research method is the analysis of tokenized text using word count functions, bigrams, and trigrams in selected sections of a scientific publication. The results of text mining analysis were compared with the classic, non-automated text analysis of the publication. The presented study is a pilot project in the form of a case study. Findings: The proposed method of analyzing a scientific text using an analysis of the frequency of words and n-grams enables inference of the content of the paper with regard to the names of variables involved in the study, the statistical apparatus used and the key literature cited. It should be observed, however, that the discussed method does not make it possible to establish which variables are moderators and which are mediators. Originality/value: In this paper, the text mining technique was used differently in the discussed study than in previous works. The publication was not examined in its entirety, as previous researchers did, but text mining analysis was applied to individual parts of the paper, i.e. the part discussing theoretical foundations of the research and the part presenting the research method, research results, and their discussion. This allowed for obtaining more precise results regarding the content of the publication.

4

Implementacja środowiska testowego w języku R

Baumgart Jan

Studia i Materiały Informatyki Stosowanej

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2019

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nr 1

14--19

PL

W pracy przedstawione zostały biblioteki oraz ich zastosowanie do implementacji środowiska testowego algorytmów rojowych. Wykorzystane moduły pozwalają przygotować w pełni sprawne narzędzie w szybki sposób. Przedstawione środowisko testowe w tym artykule zostało przygotowane do wspomagania badań nad algorytmami rojowymi i może być wykorzystane jako zasób sieciowy jak i skrypt dostępny lokalnie. Metody wykorzystane w tym artykule mogą posłużyć do budowy środowisk testowych dla wielu innych nie związanych z algorytmami rojowymi sceneriów.

EN

The work presents libraries and their application for implementing the swarm algorithms test environment. The modules used allow you to prepare a fully functional tool quickly. The test environment presented in this article has been prepared to support research on swarm algorithms and can be used as a network resource as well as a locally available script. The methods used in this article can be used to build test environments for many other scenery not related to swarm algorithms.

5

Environmental dose rate determination using a passive dosimeter: Techniques and workflow for α-Al2O3:C chips

Kreutzer S., Martin L., Guérin G., Tribolo Ch., Selva P., Mercier N.

Geochronometria

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2018

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Vol. 45, no. 1

56--67

EN

In situ dosimetry (active, passive dosimeters) provides high accuracy by determining environmental dose rates directly in the field. Passive dosimeters, such as α-Al2O3:C, are of particular interest for sites with desired minimum disturbance (e.g., archaeological sites). Here, we present a comprehensive approach obtaining the environmental cosmic and γ-dose rate using α-Al2O3:C chips. Our procedure consists of (1) homemade field containers, (2) a homemade bleaching box, (3) a rapid measurement sequence and (4) software based on R to process the measurement results. Our validation steps include reproducibility, irradiation time correction, cross-talk evaluation and source calibration. We further simulate the effect of the container against the infinite matrix dose rate, resulting in attenuation of ca. 6%. Our measurement design uses a lexsyg SMART luminescence reader equipped with green LEDs. The irradiation is carried out under the closed β-source. The minimum dose that can be determined was estimated with ca. 10 μGy. However, we also show that for the equipment used, an irradiation time correction of ca. 2.6 s is needed and irradiation cross-talk should be taken into account. The suggested procedure is cross-checked with four reference sites at Clermont-Ferrand showing a good γ-dose rate for three out of the four sites. Finally, an application example, including needed analytical steps, is presented for dosimeters buried at the archaeological site of the Sierra de Atapuerca (Spain).

6

Social support change as a moderator and organizational commitment as a mediator between pre-entry expectation and turnover intention : a study among life insurance agents in Tianjin, China

Hao L., Arsiah B., Awangku H. B. P. B.

Polish Journal of Management Studies

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2017

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Vol. 15, No. 2

58--68

EN

The study intents to understand the social support change's moderation effect and organizational commitment’s mediation effects between the relationships of pre-entry expectation and turnover intention among the life insurance agents in Tianjin, China. Partial least squares structural equation modelling (PLS-SEM) was employed as the method of the analysis. Statistical environment R version 3.1.0 was used as the tool of analysis. Six of seven hypotheses were accepted. As the result, perceived performance is more determinative than pre-entry expectation of defining confirmation of expectation. Organizational commitment is more important than post-entry satisfaction when employees making decision of staying. High composite reliability needs to be investigated whether caused by the life insurance agents’ job nature or the poor content validity of the instrument. Original value of paper: The paper applies expectation confirmation theory into human resource context.

PL

Celem badania jest zrozumienie efektu moderacji pomocy społecznej i efektów pośrednictwa zaangażowania organizacji między relacjami oczekiwań przed wejściem do obrotu a zamiarem obrotu wśród agentów ubezpieczeniowych na życie w Tianjin, w Chinach. Jako metodę analizy wykorzystano modelowanie równań częściowych najmniejszych kwadratów (ang. Partial least squares structural equation modelling, PLS-SEM). Jako narzędzie analizy wykorzystano środowisko statystyczne R wersja 3.1.0. Sześć z siedmiu hipotez zostało zaakceptowanych. W rezultacie, postrzegana wydajność jest bardziej rozstrzygająca niż oczekiwania dotyczące zdefiniowania potwierdzenia oczekiwania. Zobowiązanie organizacyjne jest ważniejsze niż zadowolenie z pracy, gdy pracownicy decydują o pozostaniu. Niezbędne jest zbadanie wysokiej złożonej niezawodności, niezależnie od tego, czy jest to spowodowane charakterem pracy lub brakiem użyteczności instrumentu. Oryginalne osiągnięcie artykułu: W artykule przedstawiono teorię potwierdzania oczekiwania (ang. expectation confirmation theory) w kontekście zasobów ludzkich.

7

ChR: Dynamic Functional Constraints Checking in R

Grzanek K.

Journal of Applied Computer Science Methods

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2017

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Vol. 9 No. 1

65--78

EN

Dynamic typing of R programming language may issue some quality problems in large scale data-science and machine-learning projects for which the language is used. Following our efforts on providing gradual typing library for Clojure we come with a package chR - a library that offers functionality of run-time type-related checks in R. The solution is not only a dynamic type checker, it also helps to systematize thinking about types in the language, at the same time offering high expressivenes and full adherence to functional programming style.

8

Solving boundary value problems in the open source software R: package bvpSolve

Mazzia F., Cash J. R., Soetaert K.

Opuscula Mathematica

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2014

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Vol. 34, no. 2

387--403

EN

The R package bvpSolve for the numerical solution of Boundary Value Problems (BVPs) is presented. This package is free software which is distributed under the GNU General Public License, as part of the R open source software project. It includes some well known codes to solve boundary value problems of ordinary differential equations (ODEs) and differential algebraic equations (DAEs). In addition to the packages already available for solving initial value problems, the new package now allows non expert users to efficiently solve boundary value problems in the problem solving environment R.

9

Genomic Virtual Laboratory

Cegielska B., Kaliszan D., Handschuh L., Figlerowicz M., Meyer N.

Computational Methods in Science and Technology

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2010

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Vol. 16, No. 1

39-49

EN

In contemporary science, virtual laboratories give a chance to improve research by facilitating access to high-throughput technologies and bioinformatics methods. The Genomic Virtual Laboratory (GVL) presented here was developed for automate analysis of data retrieved from a microarray experiment. The system was implemented for R Bioconductor-based analysis of results obtained in the study on human acute myeloid leukaemia (AML). The article extends the theoretical aspects of GVL presented earlier [8] and describes how the particular elements were integrated to establish the advanced system of two-colour microarray data analysis.