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Author |
Liang, K.-Y.; Zeger, S.L. |
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Title |
Longitudinal data analysis using generalized linear models |
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Journal Article |
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Year |
1986 |
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Biometrika |
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73 |
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1 |
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13-22 |
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This paper proposes an extension of generalized linear models to the analysis of longitudinal data. We introduce a class of estimating equations that give consistent estimates of the regression parameters and of their variance under mild assumptions about the time dependence. The estimating equations are derived without specifying the joint distribution of a subject's observations yet they reduce to the score equations for niultivariate Gaussian outcomes. Asymptotic theory is presented for the general class of estimators. Specific cases in which we assume independence, m-dependence and exchangeable correlation structures from each subject are discussed. Efficiency of the pioposecl estimators in two simple situations is considered. The approach is closely related to quasi-likelihood. |
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10.1093/biomet/73.1.1 |
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Admin @ knut @ |
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4097 |
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Author |
McNaughton, S. J.; Georgiadis, N.J. |
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Title |
Ecology of African Grazing and Browsing Mammals |
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Journal Article |
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Year |
1986 |
Publication |
Annual Review of Ecology and Systematics |
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17 |
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39-66 |
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INTRODUCTION Africa is the earth's second largest continent, comprising 20% of its surface. Largely tropical, Africa extends as well into temperate zones to 37 N and 35 S. Eastern and southern Africa display steep elevation gradients due to the prevalence there of volcanic orogeny and rifting (29). Local landscapes are distinguished by substantial geological heterogeneity, dissected land forms, and resultant steep gradients of precipitation and vegetation. The consequent pronounced fragnientation of habitats and sharp juxtaposition of distinct vegetation types, combined with climatic oscillations in geological time, contributed to major adaptive radiations of the mammalian fauna (102, 120). Early zoological expeditions recorded that habitat fragmentation and wide spatial variation of animal densities and diversities were distinctive features of African ecosystems (92, 138, 162, 226). Those early records provided the bases of natural history information on animal distributions, habitat preferences, feeding habits, and general ecology; scientific research followed only much later (201). Modem scientific study of African savanna-grassland mammals began in the 1950s (23, 24, 107, 108, 148, 149, 197,203, 204, 210,230), long after the distributions and densities of the major game animals had been affected by growing human populations, colonial land and hunting policies, and virulent exotic diseases that affected the animals both directly and indirectly (57). The mammalian fauna has been increasingly isolated and fragmented within game reserves of varying size, habitat diversity, and animal species diversity; the ability to sustain it in the absence of active management is increasingly questioned (112, 187). For species with population sizes greater than 100 individuals, game reserve area (A) and faunal ... |
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Equine Behaviour @ team @ |
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4255 |
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Author |
Springorum B. |
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Title |
Hinweise zum Konditionstraining der Military-Pferde |
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1986 |
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FN-Verlag |
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Warendorf |
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3 88542 167 4 |
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Equine Behaviour @ team @ |
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4439 |
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Author |
Donner, H.D. |
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Title |
Grundausbildung für Reiter und Pferd |
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1986 |
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Ausbildung; Dressurreiten; Geländereiten; Grundausbildung; Pferd; Pferdesport; Reiten; Reitsport; Sportausrüstung; Springreiten |
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Abstract |
Verf. gibt einen Ueberblick ueber: 1) Grundausbildung des Reiters: a) Vorbedingungen fuer eine erfolgreiche Ausbildung, b) Sitz und Sitzschulung, c) Einwirkung des Reiters, d) Reiten von Grunduebungen und Dressurlektionen, e) Springausbildung, f) Gelaendereiten sowie 2) Grundausbildung des Pferdes: a) Grundkenntnisse fuer den Ausbilder ueber Charakter und Wesen des Pferdes, Grundsaetze und Erziehung, anatomisch-physiologische Voraussetzungen, b) Allgemeine Grundausbildung, c) Grundausbildung im Springen und im Gelaende, d) Arbeit mit Pferden mit Gebaeude- und Temperamentsfehlern. Schiffer |
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FN-Verl. d. Dt. Reiterlichen Vereinigung |
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Warendorf |
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Donner, H.D.; Specht, D. |
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25. Aufl. |
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9783885421740 |
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Equine Behaviour @ team @ Pu198801031394 |
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5972 |
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Author |
Blakeman, N.E.; Friend, T.H. |
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Title |
Visual discrimination at varying distances in Spanish goats |
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Year |
1986 |
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Appl Anim Behav Sci |
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16 |
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Equine Behaviour @ team @ Blakeman1986 |
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6251 |
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Author |
Polley, L. |
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Title |
Strongylid parasites of horses: experimental ecology of the free-living stages on the Canadian prairie |
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Journal Article |
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Year |
1986 |
Publication |
American Journal of Veterinary Research |
Abbreviated Journal |
Am J Vet Res |
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Volume |
47 |
Issue |
8 |
Pages |
1686-1693 |
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Animals; Canada; Ecology; Feces; Female; Horse Diseases/*epidemiology/parasitology; Horses; Larva; Ovum/cytology; Seasons; Strongyloides/isolation & purification; Strongyloidiasis/epidemiology/*veterinary |
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Abstract |
Each month for a 1-year period (October through September), equine fecal masses containing eggs of strongylid nematodes were placed outdoors on small grass plots in Saskatchewan, Canada. Thereafter, feces and grass from the plots were sampled after intervals of 1 week or longer, and the strongylid eggs and larvae recovered were counted. These observations were made over a 2-year period. Development of eggs to infective larvae occurred in all experiments, except those established in October, December, and January. Infective larvae from experiments set up in April through September survived that winter. During the summer, there was a gradual build up of infective larvae in the fecal masses, which reached a peak in August and September and then decreased into the winter. These results are discussed in the context of the control of strongylid parasites of horses on the Canadian prairie and in other areas of the world with a similar climate and similar horse management practices. |
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English |
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0002-9645 |
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Notes |
PMID:3752676 |
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Call Number |
Equine Behaviour @ team @ |
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2682 |
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Author |
Gittleman, J.L. |
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Title |
Carnivore Life History Patterns: Allometric, Phylogenetic, and Ecological Associations |
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Journal Article |
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Year |
1986 |
Publication |
The American Naturalist |
Abbreviated Journal |
Am Nat |
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Volume |
127 |
Issue |
6 |
Pages |
744-771 |
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The University of Chicago Press for The American Society of Naturalists |
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0003-0147 |
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Equine Behaviour @ team @ |
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5453 |
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Author |
Zumpe, D.; Michael, R.P. |
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Title |
Dominance index: A simple measure of relative dominance status in primates |
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1986 |
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American journal of primatology |
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Am. J. Primatol. |
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10 |
Issue |
4 |
Pages |
291-300 |
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A simple measure of relative dominance status (cardinal rank) is described which we have termed the dominance index. Like more familiar techniques for assessing rank order, it is based on the direction of aggressive and submissive behaviors between all possible paired combinations of animals in a social group. Using data from five groups of female rhesus monkeys, it reliably produced the same ordinal ranks as fight interaction matrices. There was also good agreement with the cardinal ranks produced by two additional measures of dominance and with those produced by observer ratings. The dominance index can be calculated when fights have not actually occurred and is largely independent of the frequency of agonistic interactions. It has, therefore, wide application and can estimate dominance during brief sampling periods (one hour) and also in stable groups when agonistic interactions are low. Its application is described in experiments in which the male in a group of females was changed and the hormonal status of the females was altered. Estrogen increased female dominance status relative to other females. |
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1098-2345 |
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refbase @ user @ DorisZumpe1986 |
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871 |
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Author |
Crowell-Davis, S.L. |
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Title |
Spatial relations between mares and foals of the Welsh pony (Equus caballus) |
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Journal Article |
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1986 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Anim Beh |
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34 |
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4 |
Pages |
1007-1015 |
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Welsh pony mares and foals (Equus caballus) were usually found to be within 1 or 5 m of each other during the first week of the foal's life and gradually spent more time at greater distances as the foals became older. There was an overall levelling of the trend during the 9th-15th weeks of life of the foal, followed by a second period of change during weeks 16-24. Through weeks 21-24, mares and foals spent at least half of their time within 5 m of each other. Proximity was primarily due to foal activity except during foal recumbency. During the first 8 weeks of the foal's life, a mare remained close by when it was recumbent, either by grazing in a circle around it or by standing upright beside it. Mares and foals were most likely to be close together when they were resting upright with the other ponies in the herd and most likely to be far apart when the foal was playing. Similarities in patterns of spatial relationship between the foals of a given mare were demonstrated. There was no difference between colts and filies in the development of independence. |
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0003-3472 |
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Equine Behaviour @ team @ |
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6505 |
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Author |
Eccles, T.R.; Shackleton, D.M. |
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Title |
Correlates and consequences of social status in female bighorn sheep |
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Journal Article |
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1986 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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34 |
Issue |
5 |
Pages |
1392-1401 |
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Dominance-subordinance relationships among a captive group of adule bighorn sheep (Ovis canadensis californiana) were studied from May 1977 to December 1978. Social interactions between females were brief in duration and infrequent. Although a dominance hierarchy was evident among the females, it was not linear. Horn length and body weight were not consistently correlated with social status. The highest ranking females were the most aggressive individuals, initiating more agonistic interactions than subordinates. Females with high social status did not have higher quality diets, lower activity costs, or higher productivity than low ranking females. |
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refbase @ user @ |
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753 |
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