Methods for analysis of community data in ecological studies, including correspondence analysis, direct gradient analysis, and indirect gradient analysis.

The Bureau of Labor Statistics is the principal fact-finding agency for the Federal Government in the broad field of labor economics and statistics.

Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment.

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Founded in 1915, the Ecological Society of America (ESA) is a scientific, non-profit, organization with over 10,000 members. Through ESA reports, journals, membership research, and expert testimony to Congress, ESA seeks to promote the responsible application of ecological data and principles to the solution of environmental problems. For more information about the Society and its activities, access ESA's web site at: http://www.esa.org/.