Multiple Factor Analysis by Example Using R

Pagès, Jacques

doi:10.1201/b17700

Cited by 181 publications

(194 citation statements)

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“…Using the raw data, the correlation matrix of the attributes was used as the input of the AHC in the form of a distance matrix. 44 This clustering revealed similar results to the original clustering, confirming the validity of the dendrogram depicted in Fig. 8 and the perceptual constructs identified.…”

Section: Clustering Of Elicited Attributessupporting

confidence: 72%

“…However, in FP each assessor uses his/her own vocabulary, thus, an attribute given and scored by an assessor may not necessarily relate to a semantically similar attribute given by another assessor. 43 A mathematically based approach, i.e., using the geometrical and the statistical properties of the data points, 44 would reveal the true structure within the dataset. Combined with the definitions given by assessors the internal validity of the formed clusters could be assessed.…”

Section: Generalizing Results-averagingmentioning

confidence: 99%

“…29 The mathematical transformations of MFA provide a number of complementary information, allowing the analysis of qualitative and quantitative data in a common latent space. 43,44 In this study, the analysis is based on MFA, aiming to devise a common consensus space across assessors, whilst identifying the most important components, observations, and attributes. 44,45 MFA studies the relations between several predetermined groups of attributes and it could be viewed as a consensus principle component analysis (PCA), built on a set of equally weighted principal components.…”

Section: Discussionmentioning

confidence: 99%

“…43,44 In this study, the analysis is based on MFA, aiming to devise a common consensus space across assessors, whilst identifying the most important components, observations, and attributes. 44,45 MFA studies the relations between several predetermined groups of attributes and it could be viewed as a consensus principle component analysis (PCA), built on a set of equally weighted principal components. MFA performs PCA on the attributes of each assessor separately, which are then normalized 46 to balance the influence of each group on the computation of the consensus space.…”

Section: Discussionmentioning

confidence: 99%

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Perceptual aspects of reproduced sound in car cabin acoustics

Kaplanis

Bech

Tervo

et al. 2017

The Journal of the Acoustical Society of America

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An experiment was conducted to determine the perceptual effects of car cabin acoustics on the reproduced sound field. In-car measurements were conducted whilst the cabin's interior was physically modified. The captured sound fields were recreated in the laboratory using a three-dimensional loudspeaker array. A panel of expert assessors followed a rapid sensory analysis protocol, the flash profile, to perceptually characterize and evaluate 12 acoustical conditions of the car cabin using individually elicited attributes. A multivariate analysis revealed the panel's consensus and the identified perceptual constructs. Six perceptual constructs characterize the differences between the acoustical conditions of the cabin, related to bass, ambience, transparency, width and envelopment, brightness, and image focus. The current results indicate the importance of several acoustical properties of a car's interior on the perceived sound qualities. Moreover, they signify the capacity of the applied methodology in assessing spectral and spatial properties of automotive environments in laboratory settings using a time-efficient and flexible protocol.

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Section: Clustering Of Elicited Attributessupporting

confidence: 72%

Section: Generalizing Results-averagingmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Perceptual aspects of reproduced sound in car cabin acoustics

Kaplanis

Bech

Tervo

et al. 2017

The Journal of the Acoustical Society of America

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“…Data editing and the descriptive analyses (percentage distributions, averages, standard deviations, 95% confidence intervals) were performed using Microsoft Excel r . A Multiple Factor Analysis (Pagès, 2014) 2008) to classify surveyed farms according to their main production. This typology is defined by structural farm characteristics (e.g.…”

Section: Discussionmentioning

confidence: 99%

Survey of 47 oilseed flax (Linum usitatissimumL.) growers to identify ways to expand its cultivation in France

Carof

Raimbault

Merrien

et al. 2015

OCL

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-Over the past 20 years in France, oilseed flax (Linum usitatissimum L.) has usually been grown on less than 20 000 ha per year while needs of the French linseed sector are estimated at around 30 000 ha per year. In this article we identify ways to increase the cultivation of oilseed flax in France. Forty-seven linseed producers were surveyed in January 2013. The aim of this survey was to (i) describe farming systems that currently grow oilseed flax (e.g. size, nature of production, farmers' goals), (ii) identify farmers' perceptions of strengths and weaknesses of oilseed flax in their farming systems, and (iii) test farmers' reactions to scenarios created to facilitate expansion of oilseed flax cultivation. Surveys reveal a wide diversity of farming systems that produce linseed, from those specialised in crop production to those specialised in animal production. According to surveyed farmers, main advantages of oilseed flax are related to its compatibility with the farm work schedule. It is also useful agronomically, as it is a beneficial preceding crop and increases the duration of crop rotations. It is also a valuable alternative to crops that become difficult to grow. Its main drawback is that it provides insufficient profits. As for the expansion scenarios, cultivation of oilseed flax may increase if the linseed sector addresses genetic improvement (i.e. new oilseed flax cultivars), technical progress (especially in pest and disease management), and economic subsidies (e.g. a minimum price for linseed). Keywords:Crop diversification / oilseed flax advantages / scenarios / expansion of oilseed flax cultivation Résumé -En France le lin oléagineux (Linum usitatissimum L.) est régulièrement cultivé sur moins de 20 000 ha alors que les besoins de la filière française sont estimés à près de 30 000 ha. Cet article se propose donc de déterminer des leviers agronomiques, économiques et organisationnels à actionner pour développer la surface métropolitaine de cette culture. Quarante-sept agriculteurs produisant du lin oléagineux (ou en ayant produit récemment) ont été enquêtés en Janvier 2013. Cette enquête devait permettre (i) de caractériser les exploitations productrices de lin oléagineux (taille, nature des productions, objectifs de l'exploitant, etc.), (ii) d'identifier, aux dires des agriculteurs, les atouts et faiblesses du lin oléagineux dans leurs systèmes de production et (iii) de recueillir les réactions des enquêtés à l'énoncé de scénarios imaginés pour faciliter le développement de la culture de lin oléagineux. Les enquêtes révèlent une importante diversité de types de système produisant du lin oléagineux, depuis ceux spécialisés en grandes cultures jusqu'à ceux spécialisés en productions animales. Aux dires des agriculteurs, les atouts du lin oléagineux sont liés à sa facilité à s'insérer dans le calendrier de travail. Il est aussi apprécié pour sa capacité à allonger les rotations et à se substituer à des cultures pour lesquelles les agriculteurs sont dans une impasse technique. Son principal ...

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Synthesis of public water supply use in the United States: Spatio‐temporal patterns and socio‐economic controls

et al. 2017

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Recent U.S. Geological Survey water-use report suggests that increasing water-use efficiency could mitigate the supply-and-demand imbalance arising from changing climate and growing population. However, this rich data have neither analyzed to understand the underlying patterns, nor have been investigated to identify the factors contributing to this increased efficiency. A national-scale synthesis of public supply withdrawals ("withdrawals") reveals a strong North-south gradient in public supply water use with the increasing population in the South contributing to increased withdrawal. Contrastingly, a reverse South-north gradient exists in per capita withdrawals ("efficiency"), with northern states consistently improving the efficiency, while the southern states' efficiency declined. Our analyses of spatial patterns of per capita withdrawals further demonstrate that urban counties exhibit improved efficiency over rural counties. Improved efficiency is also demonstrated over high-income and well-educated counties. Given the potential implications of the findings in developing long-term water conservation measures (i.e., increasing block rates), we argue the need for frequent updates, perhaps monthly to annual, of water-use data for identifying effective strategies that control the water-use efficiency in various geographic settings under a changing climate.

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Multiple Factor Analysis by Example Using R

Cited by 181 publications

References 0 publications

Perceptual aspects of reproduced sound in car cabin acoustics

Perceptual aspects of reproduced sound in car cabin acoustics

Survey of 47 oilseed flax (Linum usitatissimumL.) growers to identify ways to expand its cultivation in France

Synthesis of public water supply use in the United States: Spatio‐temporal patterns and socio‐economic controls

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