Exploratory Multivariate Analysis by Example Using R

Husson, François

doi:10.1201/b10345

Cited by 251 publications

(155 citation statements)

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“…The graphical data representation of salinity and plant interactions whenever provided by PC-biplot is so informative that it requires only a look to understand the potential salt tolerance of genotypes (Raza et al, 2016). PCA was obtained following the method as given by Husson et al (2011).…”

Section: Discussionmentioning

confidence: 99%

Improving salt tolerance and weight percent reduction in tomato by exploiting physio-agronomic seedling traits

Raza¹,

Saeed²,

Munir³

et al. 2018

Afr. J. Agric. Res.

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Salinity being a serious limitation to crop production is an established fact since ages. It has adversely affected the adaptive behavior of our field crops particularly at seed germination and seedling stages. Identification of particular plant traits conferring salinity tolerance is important for inducing genetic variation among the target traits and adjusting the selection pressure for them in field. This experimental study was conducted to explore percent (%) weight loss of roots and shoots at increasing salt stresses (control, 10 dS m -1 and 15 dS m -1 ) along with certain dry weight and cationic ratio tolerance indices. The experiment was conducted in the glasshouse to screen seedlings of 25 tomato genotypes. Principal component analysis and correlation analysis were used to screen the genotypes for variability and salt tolerance. Based on associative interactions for salt tolerance traits and highly negative response towards weight percent (%) reductions, three genotypes were identified as salt tolerant; BEAVER LODGE SLICER, ZARNITZA, and FORME DE COEUR. Two genotypes GLACIER and Rio-GRANDE were highly positive for K + /Na + and Ca 2+ /Na + ratios tolerance indices. Based on these findings, the genotypes BEAVER LODGE SLICER, ZARNITZA and FORME DE COEUR are suggested to be planted in salt affected area. The six genotypes (ANAHU, LO-2707, 17860, UOVO ROSEO, NAGINA and LA-2821) showed significant negative behavior towards weight % reduction, and a little positive towards salt tolerance indices were considered as moderately salt tolerant.

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Section: Discussionmentioning

confidence: 99%

Improving salt tolerance and weight percent reduction in tomato by exploiting physio-agronomic seedling traits

Raza¹,

Saeed²,

Munir³

et al. 2018

Afr. J. Agric. Res.

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“…O primeiro fator é o mais importante, explicando as maiores porções da inércia (o termo empregado para referir-se à variância) seguido pelo segundo, terceiro, e assim por diante. Os fatores podem ser representados geometricamente em mapas em que pontos específi cos (perfi s individuais ou de variáveis) podem ser projetados, tornando possível capturar a estrutura dos dados (Greenacre, 2007;Husson, Lê, & Pagès, 2011). No presente caso, os indivíduos estatísticos, ou casos, eram os resumos, e as variáveis ativas eram as categorias de grupos e objetos.…”

Section: Tabela 1 Objetos E Grupos Sociais Estudados Em Cada Resumo Punclassified

Um panorama da literatura relacionada às representações sociais publicada em periódicos científicos

Wachelke

Matos

Ferreira

et al. 2015

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ResumoO presente estudo visa a caracterizar parte da produção acadêmica sobre representações sociais publicada em periódicos científi cos, de modo a fornecer informações sobre o desenvolvimento e estado atual do campo. Em agosto e setembro de 2013 foram obtidos 2526 resumos de artigos publicados em periódicos indexados em quatro bases de dados, todos sobre representações sociais. Para cada resumo foram registrados o país da instituição do primeiro autor, ano de publicação, disciplina do periódico e informações categorizadas relativas aos grupos e objetos sociais estudados. Os resultados confi rmaram e expandiram meta-análises realizadas anteriormente, evidenciando uma contraposição entre estudos aplicados na área de saúde com grupos e objetos relacionados, mais típicos da América do Sul e Brasil e pesquisas psicossociais ligadas à área da psicologia e realizadas por pesquisadores principalmente do continente europeu. Nota-se também um aumento de importância considerável na participação de primeiros autores brasileiros e sul-americanos em relação ao total, tornando-se líder no volume de produção acadêmica na área, substituindo autores provenientes de instituições europeias. Palavras-chave:Representações sociais, produção científi ca, pesquisa bibliográfi ca, Bibliometria. An Overview of the Literature Related to Social Representations Published in Scientifi c Journals AbstractThe present study aims at characterizing part of the academic production on social representations published in scientifi c journals, so as to provide information about the development and current state of the fi eld. In August and September 2013 2526 abstracts of papers published in journals indexed in four databases were retrieved, all of which were about social representations. For each abstract registers were made concerning the country in which the fi rst author's institution was located, publication year, journal discipline and categorized information relative to the studied group and social objects. The results confi rmed and expanded previously conducted meta-analyses, giving evidence of a contrast between applied studies in the health area involving related groups and objects, more typical from South America 1 Endereço para correspondência:

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“…Holmes and Crofts (2010) suggested using 100 lemmas, Burrows (2002) between 40 and 150. After applying the PCA method using the R system (Crawley, 2007;Husson et al, 2011), we obtained the results shown in Figure 1. This graph shows the relative position of each English text according to the two most important dimensions.…”

Section: Principal Component Analysis and Nearest Neighbormentioning

confidence: 99%

Authorship Attribution: A Comparative Study of Three Text Corpora and Three Languages

Savoy

2012

Journal of Quantitative Linguistics

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The first objective of this paper is carry out three experiments intended to evaluate authorship attribution methods based on three test-collections available in three different languages (English, French, and German). In the first we represent and categorize 52 text excerpts written by nine authors and taken from 19th century English novels. In the second we work with 44 segments from French novels written by eleven authors, mostly from the 19th century. In the third we extract 59 German text excerpts from novels published mainly during the 19th and the beginning of the 20th century, written by 15 authors. The second objective is to analyse performance differences obtained when using word types or lemmas as text representations, and the third objective is to evaluate three authorship attribution schemes, the first of which uses principal component analysis (PCA), the second applies the Delta approach, and the third corresponds to a new authorship attribution method based on specific vocabulary. This concept is computed for a given text (or author profile) and then compared with the entire corpus. Based on this information, we show how a distance measure can be derived and by means of the nearest neighbor approach we suggest a simple and efficient authorship attribution scheme. Based on three test collections and using either word types or lemmas as features, we demonstrate that the suggested classification scheme performs better than the PCA method, and slightly better than the Delta approach.

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Exploratory Multivariate Analysis by Example Using R

Cited by 251 publications

References 0 publications

Improving salt tolerance and weight percent reduction in tomato by exploiting physio-agronomic seedling traits

Improving salt tolerance and weight percent reduction in tomato by exploiting physio-agronomic seedling traits

Um panorama da literatura relacionada às representações sociais publicada em periódicos científicos

Authorship Attribution: A Comparative Study of Three Text Corpora and Three Languages

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