ex1317(Sleuth2)
ex1317()所属R语言包:Sleuth2
Dinosaur Extinctions—An Observational Study
恐龙灭绝的观察研究
译者:生物统计家园网 机器人LoveR
描述----------Description----------
About 65 million years ago, the dinosaurs suffered a mass extinction virtually overnight (in geologic time). Among many clues, one that all scientists regard as crucial is a layer of iridium-rich dust that was deposited over much of the earth at that time. The theory is that an event like a volcanic eruption or meteor impact caused a massive dust cloud that blanketed the earth for years killing off animals and their food sources. Dataset has Iridium depths by type of deposit.
大约在6500万年前,恐龙几乎在一夜之间遭受了大灭绝(在地质时间)。在众多线索中,所有的科学家都认为是至关重要的,是一个沉积层中铱丰富的灰尘,当时地球。该理论认为,像火山爆发或流星撞击事件造成了巨大的尘埃云笼罩大地杀死动物,它们的食物来源。数据集铱深处矿床类型。
用法----------Usage----------
ex1317
格式----------Format----------
A data frame with 28 observations on the following 3 variables.
一种数据框与28上的以下3个变量的观测。
IridiumIridium in samples (ppt)
Iridium铱样品中(PPT)
Strataa factor with levels "Limestone" and "Shale"
Strata水平"Limestone"和"Shale"的一个因素
Deptha factor with six levels: "1", "2", ..., "6"
Depth的因素有六个等级:"1","2",...,"6"
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----------
Alvarez, W. and Asaro, F. (1990). What Caused the Mass Extinction? An Extraterrestrial Impact, Scientific American 263(4): 76–84.
Courtillot, E. (1990). What Caused the Mass Extinction? A Volcanic Eruption. Scientific American 263(4): 85–92.
实例----------Examples----------
str(ex1317)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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