Michael Greenacre
Barcelona Graduate School of Economics
StatisticsCorrespondence analysisEconometricsMathematicsMultiple correspondence analysis
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Publications 145
#1Martin GraeveH-Index: 27
#2Michael Greenacre (Barcelona Graduate School of Economics)H-Index: 30
Fatty acid (FA) compositions provide insights about storage and feeding modes of marine organisms, characterizing trophic relationships in the marine food web. Such compositional data, which are normalized to sum to 1, have values—and thus derived statistics as well—that depend on the particular mix of components that constitute the composition. In FA studies, if the set of FAs under investigation is different in two separate studies, all the summary statistics and relationships between the FAs ...
#1Michael Greenacre (Barcelona Graduate School of Economics)H-Index: 30
Abstract Amalgamations (i.e. summing) of parts can be included as new parts in compositional data analysis, and logratios can then be formed using these amalgamations as well as any of the individual parts themselves. In the first contribution of this paper, a comparison is made of the performance of different logratio transformations in explaining the structure of a geochemical data set − some of the transformations include amalgamations. The second contribution shows how amalgamations suggest ...
1 CitationsSource
#1Michael Greenacre (UPF: Pompeu Fabra University)H-Index: 30
1 CitationsSource
#1Michael Greenacre (Barcelona Graduate School of Economics)H-Index: 3
In the approach to compositional data analysis originated by John Aitchison, a set of linearly independent logratios (i.e., ratios of compositional parts, logarithmically transformed) explains all the variability in a compositional data set. Such a set of ratios can be represented by an acyclic connected graph of all the parts, with edges one less than the number of parts. There are many such candidate sets of ratios, each of which explains 100% of the compositional logratio variance. A simple c...
7 CitationsSource
#1Martin PaarH-Index: 2
#2Benoit LebretonH-Index: 13
Last. Harald AsmusH-Index: 28
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#1Michael Greenacre (UPF: Pompeu Fabra University)H-Index: 30
7 Citations
#1Ane Cecilie Kvernvik (UNIS: University Centre in Svalbard)H-Index: 1
Last. Eva LeuH-Index: 19
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Arctic microalgae experience long periods of continuous darkness during the polar night, where they are unable to photosynthesize. Despite numerous studies on overwintering strategies, such as utilization of stored energy products, formation of resting stages, reduction of metabolic rate and heterotrophic lifestyles, there have been few attempts to assess the in situ physiological state and restoration of the photosynthetic apparatus upon re‐illumination. In this study, we found diverse and acti...
5 CitationsSource
#1Jordi Grinyó (CSIC: Spanish National Research Council)H-Index: 9
#2Andrea Gori (University of Barcelona)H-Index: 41
Last. Josep Maria Gili (CSIC: Spanish National Research Council)H-Index: 48
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Abstract Highly diverse megabenthic assemblages dominated by passive and active suspension feeders have been recently reported in shelf edge environments of the Mediterranean Sea. Due to their frequent association with species of commercial interest, these assemblages have been heavily impacted by fishing. The vulnerability and low resilience of these assemblages, composed mainly by long-living and slow-growing species, have motivated the implementation of management measures such as the restric...
6 CitationsSource
#1Per-Otto JohansenH-Index: 2
Last. Hans Tore Rapp (University of Bergen)H-Index: 22
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Abstract Quantitative analyses of soft bottom invertebrate fauna from four Norwegian sill fjords show increased macrofaunal abundance, species richness, and a considerably changed benthic deep water macrofaunal composition in the inner parts of the fjord system. In retrospect, the analyses show significantly altered benthic macrofaunal community structure that was not reflected by the changes in the Shannon-Wiener diversity indices during regular monitoring. The observed changes are mainly due t...
3 CitationsSource
#1Tor Korneliussen (Nord University)H-Index: 11
#2Michael Greenacre (Barcelona Graduate School of Economics)H-Index: 30
This study investigates which information sources European tourists use when making decisions about their travel/ holiday plans. Using survey data based on national representative samples of tourists from 27 member countries of the European Union allows generalizable conclusions to be drawn. The data were analysed using correspondence analysis of overall country data. The findings indicate that there are systematic differences in how information sources are related to one another and that the va...
5 CitationsSource