case2101(Sleuth2)
case2101()所属R语言包:Sleuth2
Island Size and Bird Extinctions
岛的大小和鸟类灭绝
译者:生物统计家园网 机器人LoveR
描述----------Description----------
In a study of the Krunnit Islands archipelago, researchers presented results of extensive bird surveys taken over four decades. They visited each island several times, cataloguing species. If a species was found on a specific island in 1949, it was considered to be at risk of extinction for the next survey of the island in 1959. If it was not found in 1959, it was counted as an “extinction”, even though it might reappear later. This data frame contains data on island size, number of species at risk to become extinct and number of extinctions.
的的Krunnit群岛在一项研究中,研究人员提出了超过四十年的丰富的鸟类调查的结果。他们参观了每一个岛屿几次,编目种。如果在一个特定的岛屿物种被发现于1949年,它被认为是在接下来的调查中的岛屿在1959年面临灭绝的危险。如果它没有被发现于1959年,它被算作“灭绝”,即使它可能会稍后出现。此数据框包含的数据上岛的大小,数量风险物种灭绝,灭绝数量。
用法----------Usage----------
case2101
格式----------Format----------
A data frame with 18 observations on the following 4 variables.
一个数据框有18以下4个变量的观察。
IslandName of Island
Island名称岛
AreaArea of Island
Area面积岛
AtriskNumber of species at risk
Atrisk种数的风险
ExtinctNumber of extinctions
Extinct灭绝数量
Details
详细信息----------Details----------
Scientists agree that preserving certain habitats in their natural states is necessary to slow the accelerating rate of species extinctions. But they are divided on how to construct such reserves. Given a finite amount of available land, is it better to have many small reserves or a few large one? Central to the debate on this question are observational studies of what has happened in island archipelagos, where nearly the same fauna tries to survive on islands of different sizes.
科学家们认为,保留一定的栖息地在他们的自然状态是必要的,以减缓物种灭绝速度加快。但是,他们如何构建此类储备上存在分歧。由于可用土地数量是有限的,更是有许多小规模的外汇储备或少数几个大吗?在这个问题上的辩论发生了什么事岛群岛,在那里几乎相同的动物的尝试,以大小不同的岛屿上生存的观测研究。
源----------Source----------
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
拉姆齐,F.L.和Schafer,D.W. (2002年)。的统计的猎犬:A课程方法的数据分析(第二版),达克斯伯里。
参考文献----------References----------
V\"ais\"anen, R.A. and J\"arvinen, O. (1977). Dynamics of Protected Bird Communities in a Finnish Archipelago, Journal of Animal Ecology 46: 891–908.
实例----------Examples----------
str(case2101)
logit <- function(p) log(p/(1-p))
plot(logit(Extinct/Atrisk) ~ log(Area), case2101)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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