pyrifos(vegan)
pyrifos()所属R语言包：vegan
Response of Aquatic Invertebrates to Insecticide Treatment
经杀虫剂处理的水生无脊椎动物
译者：生物统计家园网 机器人LoveR
描述----------Description----------
The data are log transformed abundances of aquatic invertebrate in twelve ditches studied in eleven times before and after an insecticide treatment.
数据的log转化的丰度，水生无脊椎动物11次驱虫治疗之前和之后的12个沟渠研究。
用法----------Usage----------
data(pyrifos)
格式----------Format----------
A data frame with 132 observations on the log-transformed (log(10*x + 1)) abundances of 178 species. There are only twelve sites (ditches, mesocosms), but these were studied repeatedly in eleven occasions. The treatment levels, treatment times, or ditch ID's are not in the data frame, but the data are very regular, and the example below shows how to obtain these external variables.
一个数据框有132个对数转换（log(10*x + 1)178种）丰度的观察。有12个网站（沟渠，生物群落），但这些都在11次反复研究。治疗，治疗时间，或沟ID的数据框中，但数据是很有规律的，下面的例子演示了如何获得这些外部变量。
Details
详细信息----------Details----------
This data set was obtained from an experiment in outdoor experimental ditches. Twelve mesocosms were allocated at random to treatments; four served as controls, and the remaining eight were treated once with the insecticide chlorpyrifos, with nominal dose levels of 0.1, 0.9, 6, and 44 mu g/ L in two mesocosms each. The example data set invertebrates. Sampling was done 11 times, from week -4 pre-treatment through week 24 post-treatment, giving a total of 132 samples (12 mesocosms times 11 sampling dates), see van den Brink & ter Braak (1999) for details. The data set contains only the species data, but the example below shows how to obtain the treatment, time and ditch ID variables.
该数据集是从实验中在室外实验沟渠中。 12个生物群落被随机分配在治疗4作为对照组，治疗一次，其余八人的杀虫剂毒死刻度线，与标称剂量水平为0.1，0.9，6，和44 mu g / L的两个生物群落每个。示例数据集的无脊椎动物。采样11次，从周-4治疗前经过24周的治疗后，提供共132个样本（12的生物群落倍11采样日期），凌科后Braak（1999）。该数据集包含的物种数据，但下面的例子演示了如何获得治疗，时间和沟ID变量。
源----------Source----------
CANOCO 4 example data, with the permission of Cajo J. F. ter Braak.
CANOCO 4个示例数据，查约JF后Braak的许可。
参考文献----------References----------
curves: Analysis of time-dependent multivariate responses of biological community to stress. Environmental Toxicology and Chemistry, 18, 138–148.
实例----------Examples----------
data(pyrifos)
ditch <- gl(12, 1, length=132)
week <- gl(11, 12, labels=c(-4, -1, 0.1, 1, 2, 4, 8, 12, 15, 19, 24))
dose <- factor(rep(c(0.1, 0, 0, 0.9, 0, 44, 6, 0.1, 44, 0.9, 0, 6), 11))
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
注3：如遇到不准确之处，请在本贴的后面进行回帖，我们会逐渐进行修订。
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发表于 2012-10-1 15:11:46
