Computer Illustrations of Two Statistical principles     

J. M. BLAND 《Teaching Statistics》1985,7(3):74-77

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共现分析在文本知识挖掘中的应用研究   总被引：1，自引：0，他引：1       下载免费PDF全文

王曰芬  宋爽  卢宁  朱烨 《中国图书馆学报》2007,33(2)

共现分析是将各种信息载体中的共现信息定量化的分析方法,是支撑知识挖掘和知识服务的重要手段和工具。能够体现信息的内容特征和外表特征共同构成了文本知识关联揭示和知识挖掘的基础。探索了共现分析方法在基于空间分析、时间分布和内外关联映射的文本知识挖掘中的应用。图8。参考文献13。  相似文献   

模拟高原训练对小鼠骨骼肌代谢的影响   总被引：9，自引：0，他引：9  

李世成  田野 《北京体育大学学报》1998,(2)

观察小鼠骨骼肌代谢能力在高原训练返回平原后三周内的变化趋势,对高原训练后生理效应的时相性变化特点进行初步研究。结果显示：在模拟高原训练（2300±50m）四周后的平原效应期间,小鼠骨路肌代谢酶MDH活性呈现继续增加的趋势,并且这种趋势在返回平原后第10天和第ZI天更为显著,预示骨赂肌代谢能力在该阶段具有明显优势。  相似文献   

间歇性低氧训练对小鼠股四头肌和心肌乳酸脱氢酶含量的影响   总被引：1，自引：0，他引：1  

王茂叶 《天津体育学院学报》2007,22(2):123-125

目的:探讨间歇性低氧训练对小鼠心肌、骨骼肌中LDH含量的影响。方法:利用间歇性低氧和运动相结合的方法对小鼠进行间歇性低氧训练,测试LDH的活性。结果:心肌中,运动低氧组中LDH1含量最高;骨骼肌中,运动低氧组中LDH5含量最高。结论:间歇性低氧训练后,心肌中LDH1和股四头肌LDH5活性都有升高,既反映了糖酵解能力的提高,同时高氧化部位有更多的氧化基质,产生更多能量。IHT提高了糖酵解能力和消除乳酸的能力。  相似文献   

How Days Between Tests Impacts Alternate Forms Reliability in Computerized Adaptive Tests     

Adam E. Wyse 《Educational and psychological measurement》2021,81(4):644

An essential question when computing test–retest and alternate forms reliability coefficients is how many days there should be between tests. This article uses data from reading and math computerized adaptive tests to explore how the number of days between tests impacts alternate forms reliability coefficients. Results suggest that the highest alternate forms reliability coefficients were obtained when the second test was administered at least 2 to 3 weeks after the first test. Even though reliability coefficients after this amount of time were often similar, results suggested a potential tradeoff in waiting longer to retest as student ability tended to grow with time. These findings indicate that if keeping student ability similar is a concern that the best time to retest is shortly after 3 weeks have passed since the first test. Additional analyses suggested that alternate forms reliability coefficients were lower when tests were shorter and that narrowing the first test ability distribution of examinees also impacted estimates. Results did not appear to be largely impacted by differences in first test average ability, student demographics, or whether the student took the test under standard or extended time. It is suggested that for math and reading tests, like the ones analyzed in this article, the optimal retest interval would be shortly after 3 weeks have passed since the first test.  相似文献   

世界女子400m跑的速度分配特征探析     

王少春  闻一平 《浙江体育科学》2007,29(4):34-36

通过文献资料分析,对世界女子400m跑速度分配特征进行了探析。揭示了现代女子400m跑中各50m分段的速度分配(%)对其400m成绩的影响程度及其灰色关联极性;提出了现代女子400m跑中各50m分段的速度分配(%)的合理取值区间和取值趋向值。  相似文献   

空间lp中点集的列紧性     

王海涛 《保山师专学报》2005,24(5):27-28

记述了空间lp中点集是列紧集的判别方法及其应用.  相似文献   

Statistics using just one formula          下载免费PDF全文

Jeffrey S. Rosenthal 《Teaching Statistics》2018,40(1):7-11

This article advocates that introductory statistics be taught by basing all calculations on a single simple margin‐of‐error formula and deriving all of the standard introductory statistical concepts (confidence intervals, significance tests, comparisons of means and proportions, etc) from that one formula. It is argued that this approach will better emphasize the core concepts and commonality of statistics and range of statistical applications, without forcing the students to memorize lots of different equations.  相似文献   

图书馆面积规划的环境心理学因素分析   总被引：1，自引：0，他引：1  

张广钦 《大学图书馆学报》2009,27(3):28-33

环境心理学主要从领域性、隐私及个人空间学说三个角度解释人的社会行为与空间的关系,它在建筑学、社会学、图书馆三个方面对图书馆面积规划活动施加着各种影响。  相似文献   

基于活动属性的关键链项目资源缓冲设置方法研究     

张俊光  李伊童  万丹 《软科学》2017,(5):124-127

综合考虑资源紧张度、网络复杂度和活动间隙度3个项目属性的影响,提出了一种具有实际尺寸的项目资源缓冲设置方法.实验结果表明,设置资源缓冲后的项目工期远远小于未设置资源缓冲的工期,并且能够显著提高项目的按时完工率,并节约成本.因此,这种新的资源缓冲设置模型能对项目进行有效保护,实现工期和成本的双重优化.  相似文献