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Zoekresultaten

Zoekopdracht: faculteit: "UvA" en publicatiejaar: "1999"

AuteursJ. de Mast, K.C.B. Roes, R.J.M.M. Does
TitelThe Multi-Vari Chart -- A Systematic Approach
Uitgevers.n.
Jaar1999
FaculteitUvA
Instituut/afd.UvA: Universiteitsbibliotheek
TrefwoordenMulti-Vari Chart, Exploratory study, Control chart, graphical technique
SamenvattingPrior to setting up a designed experiment or setting up a monitoring system for a process most experimenters perform an exploratory study to investigate the structure of the process' variation. Tools that are frequently used for such a study are predominantly graphical in nature. The multi-vari chart is a useful tool to analyse measurements from a process in which several variance components can be discerned. The chart differentiates between various sources of variation, related to, e.g., time and streams of products. Visually from the chart it can be estimated whether the error variance is consistent over time and whether the other sources of variation are significant compared to the error variation. Instead of making inferences from the chart purely intuitively, this paper establishes more formal statistical tests for the analysis of multi-vari charts. For this purpose, we state a number of hypotheses that emerge frequently in multi-vari studies. To decide on these hypotheses we construct tests based on control charting methodology. Some of the hypotheses and tests are based on a random effects model whereas others are based on a mixed effects model. We study both models seperately. Augmented with these tests, the multi-vari chart turns out to be a powerful extension of the regular control chart.SR89110320519931993Actas del debate general12209217uva/uba/fgw/aclcAmsterdam [etc.]Rodopi9051835310Diálogos hispánicosAproximaciones pragmalingüísticas al español125852Berniell;;S.;;1001138;2;01;92005100;;;01;01;01-09-1986Haverkate;;W.H;Prof. drHengeveld;;K.;Prof. dr89120320519901990The hierarchical structure of the clause and the typology of adverbial satellites132570uva/uba/fgw/aclcAmsterdamBenjamins9027250235Pragmatics & beyond . New seriesLayers and levels of representation in language theory : a functional view125932Dik;;S.C.;;1001138;2;01;92005100;;;01;01;01-09-1986Vester;;E.;;Vet;;C.;;Nuyts;;J.;Bolkestein;;A.M.;Vet;;C.;89130820520002000Bifurcation routes to volatility clustering00-04uva/uba/feb/aseAmsterdamCeNDEF, Department of Economics, University of AmsterdamCeNDEF working paper317Gaunersdorfer;;A.,;;1001212;1;02;24209999;;;03;01;01-09-19921027730;1;02;24008100;24000300;;06;01;01-09-199989140120520032003Why plankton communities have no equilibrium : solution to the paradox11482549110918uva/uba/fnwi/ibed1339511004066;1;03;23172600;;;04;03;01-03-1994Scheffer;;M.;;Rinaldi;;S.;;Weissing;;F.J.;;In a classical paper, Hutchinson (1961) argued that the large number of species in most plankton communities is remarkable in view of the competitive exclusion principle, which suggests that in homogeneous, well-mixed environments species that compete for the same resources cannot coexist. Few ideas in aquatic ecology have evoked more research than this 'paradox of the plankton'. This review is an effort to put the main solutions to the paradox that have been proposed over the years into perspective. Hutchinson himself already suggested that the explanation could be that plankton communities are not in equilibrium at all due to weather-driven fluctuations. Subsequent research confirmed that such externally imposed variability can allow many species to coexist. Another important point is that in practice the homogeneous well-mixed conditions assumed in the competitive exclusion principle hardly exist. Even the open ocean, for instance, has a spatial complexity resulting from meso-scale vortices and fronts that can facilitate coexistence of species. Perhaps most excitingly, theoretical work on species interactions has given a counter-intuitive new dimension to the understanding of diversity. Various competition and predation models suggest that even in homogeneous and constant environments plankton will never settle to equilibrium. Instead, interactions between multiple species may give rise to oscillations and chaos, with a continuous wax and wane of species within the community. Long-term laboratory experiments support this view. Th
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