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实验设计 统计学是线索和思路。在查阅大量文献，心中有因果的情况下，再用统计学验证。 随机误差是动物本身存在差异。系统误差（treatment）其次，自然环境如温度、 湿度、光照、通风等存在差异 第三，饲养管理条件存在差异，第四，试验人员操作技术上存在差异 完全实验是将矩阵填满才可以得到结论，而不将矩
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posted @ 2019-11-11 16:02
YUANya
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生物统计与实验设计 随机区组设计 随机数字表示随机抽取。 单因素方差分析变为多因素方差分析，多了一个组的等级（比如家族），因为不可能找到条件完全相同的猪。多重比较只比较最初考查的那个因素（饲料），不是在分析过程中独创的因素（家族）。 拉丁方要求水平数相同，每行每列都有所有变量，对拉丁方先做随机化，行
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posted @ 2019-11-11 15:57
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Edison was more interested in the sale of Kinetoscopes(for roughly $1,000 apiece)to these parlors than in the films that would be run in them (which c
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posted @ 2019-11-08 20:25
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The extreme seriousness of desertification results from the vast areas of land and the tremendous numbers of people affected, as well as from the grea
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posted @ 2019-11-08 20:03
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By 1800 more than a thousand steam engines were in use in the British Isles, and Britain retained a virtual monopoly on steam engine production until
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posted @ 2019-11-08 19:23
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The source had long been known but not exploited. Early in the eighteenth century, a pump had come into use in which expanding steam raised a piston i
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posted @ 2019-11-08 18:46
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In the face of the upcoming water supply crisis, a number of grandiose schemes have been developed to transport vast quantities of water by canal or p
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posted @ 2019-11-08 18:02
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The vast grasslands of the High Plains in the central United States were settled by farmers and ranchers in the 1880s. This region has a semiarid clim
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posted @ 2019-11-08 17:43
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Much of the world's great architecture has been constructed of stone because of its beauty, permanence, and availability. In the past, whole cities gr
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posted @ 2019-11-08 17:23
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At the upper timberline the trees begin to become twisted and deformed. This is particularly true for trees in the middle and upper latitudes, which t
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posted @ 2019-11-08 16:54
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