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Physical Sciences and Mathematics Commons™
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Articles 1 - 3 of 3
Full-Text Articles in Physical Sciences and Mathematics
Expected Mean Squares, Richard M. Engeman
Expected Mean Squares, Richard M. Engeman
USDA Wildlife Services: Staff Publications
An interactive program for calculating the expected mean squares for balanced designs has been developed for use on desktop and minicomputers, where it would be most convenient for the typical applications of the consulting statistician. The theoretical expected mean squares are calculated from the ANOVA model; hence, data are not utilized.
Migration Patterns For Age And Sex Classes Of Blackbirds And Starlings, Richard A. Dolbeer
Migration Patterns For Age And Sex Classes Of Blackbirds And Starlings, Richard A. Dolbeer
USDA Wildlife Services: Staff Publications
Red-winged Blackbirds (Agelaius phoeniceus), Brown-headed Cowbirds (Molothrus ater), and Starlings (Sturnus vulgaris) are ubiquitous breeding birds in much of North America. The Common Grackle (Quiscalus quiscula) is an abundant breeding bird east of the Rocky Mountains (Dolbeer and Stehn 1979). Although these species are widely dispersed and generally unassociated during the nesting season, they often associated closely in winter roosts containing up to 10 million birds in the southern United States (Meanley and Webb 1965, Meanley 1971). Little is known about the comparative migration patterns of the four species and the resulting mixture of local breeding populations in winter. Comparative …
In Search Of A Diversity Ethic For Wildlife Managemen, Fred B. Samson, Fritz L. Knopf
In Search Of A Diversity Ethic For Wildlife Managemen, Fred B. Samson, Fritz L. Knopf
USDA Wildlife Services: Staff Publications
As the century nears its end and demand for food and competition for land escalate, a most important issue facing conservationists will be the preservation of a mosaic of habitats in which can be preserved a representative cross-section of native species. The need to resolve this issue is emphasized in the Global 2000 Report to the President (Council on Environmental Quality 1980) which predicts that, worldwide, 500,000 to 2 million species will become extinct by the year 2000 and that the rate will increase from one per day in 1980 to one per hour by century's end (Myers 1979). Although …