Multivariate trends in phytoplankton species groups in the southern North Sea

When assessing trends among a group of variables, there may be a joint underlying trend not evident from direct plots of the individual variables against time. To provide a simple summary of this underlying trend, linear projections of multiple time series are constructed to maximize the variance ex...

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Bibliographic Details
Published in:	ICES journal of marine science Vol. 55; no. 4; pp. 581 - 586
Main Authors:	Nicholson, Mike, Fryer, Rob, Maxwell, David
Format:	Journal Article
Language:	English
Published:	Oxford University Press 01-08-1998
Subjects:	loess Marine multivariate trend North Sea phytoplankton communities smoother ANE, North Sea smoother multivariate trend loess phytoplankton communities
Online Access:	Get full text
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Summary:	When assessing trends among a group of variables, there may be a joint underlying trend not evident from direct plots of the individual variables against time. To provide a simple summary of this underlying trend, linear projections of multiple time series are constructed to maximize the variance explained by a fitted smoother. A number of tests for assessing the significance of the fitted trend are given. The method is applied to densities of phytoplankton groups observed over a 13-month period and used to contrast the trends observed in two different areas within the southern North Sea.
Bibliography:	istex:AB57043311D5FDFF8758777D37C1A66C08AD2FF5 ArticleID:55.4.581 ark:/67375/HXZ-BV7MX4PG-S ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1054-3139 1095-9289
DOI:	10.1006/jmsc.1998.0374