共查询到19条相似文献，搜索用时 140 毫秒
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李新坚 《福建教育学院学报》2007,8(7):104-108
对多元统计数据回归处理领先提出直观评价的原理，应用这一原理解决剔除尽可能少的数据提高拟合效果的问题。再通过构建和谐企业研究的实例验证多元回归直观评价原理的实用性。 相似文献
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本文从空间图形几何直观的角度出发,给出了求空间两条直线交点坐标的几种有趣的新方法:将线与线的交点转化成求线与面的交点、将线与线的交点转化成求3个平面的交点.或者利用两条直线的交点在它们对某两个坐标面的射影柱面上的条件综合考虑. 相似文献
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"添加趋势线"是Excel进行数据拟合的一个有力工具,它使用方便,操作简单,过程生动直观.其"线性、对数、多项式、乘幂、指数、移动平均"六种拟合模型可供择优选用,为我们整理、分析各种数据,建立合理的拟合模型,并作出科学的预测创造了有利的条件. 相似文献
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周鑫 《数学学习与研究(教研版)》2015,(3):127
文章介绍了处理多元线性回归模型中多重共线性问题的有偏回归方法——岭回归和偏最小二乘回归,并通过实例比较了两种方法建立的回归方程的拟合效果,而偏最小二乘回归方法相对岭回归方法要更优. 相似文献
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根据大坝运行监测资料 ,通过逐步回归法建立的大坝安全监控模型普遍存在欠拟合问题 .本文在回归监控模型的基础上引入改进的遗传算法 ,对其回归系数进行寻优重估 ,建立遗传回归模型 .工程实例计算结果表明 ,遗传回归模型的拟合效果较原模型有明显改善 相似文献
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张文铁 《淮南师范学院学报》2006,8(3):25-27
文章介绍了使用Matlab语言处理分析化学实验数据的方法,并对实验数据作线性回归处理,找出符合条件的拟合曲线或直线,从而求得数据间的线性或非线性关系,可大大减少数据处理中引入的人为因素误差,具有简洁、高效及直观等特点。 相似文献
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Fiber Bragg grating(FBG) is used as a wavelength reference device to calibrate the position of gas absorption peak in the intracavity absorption gas sensor(ICAGS) based on erbium-doped fiberring laser.This system can detect both the reflectance spectrum of FBGs and absorption spectrum of measured gas during a single wavelength sweeping process by linearly varying the driving voltage of optic filter.The voltages corresponding to center wavelength positions of four FBGs in the spectrum are determined through ... 相似文献
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为提高木构件的白蚁防治与结构增强效率,采用目测法和质量损失率相结合的方法,在室内测试环氧树脂与白蚁防治剂的混配物对家白蚁(Coptotermes formosanus Shiraki)的抗蛀能力.试验结果表明,涂覆试件的抗蚁蛀水平均达到Ⅱ级或Ⅰ级,而对照组为Ⅲ级.涂覆试件的质量损失率均不超过对照组的8.6%;其中药胶比为1∶40的质量损失率比1∶125的低22%至41%. 相似文献
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平行度误差评定的关键在于基准拟合,其拟合精度决定误差评定结果之精度。对于平面基准和空间直线基准,数模重新整定,寻求全新算法,并论证其对"最小条件"要求的符合性,且通过了对程序进行的大量算例测试。在高精度基准拟合确定基础上,研发功能完全的平行度误差评定软件,经大量算例测试表明了其评定结果的高精度性。 相似文献
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利用高阶模糊推理系统进行曲线拟合．首先构建高阶模糊推理系统模型,然后基于梯度下降的学习算法对高阶模糊推理系统模型的权值进行改进,最后进行曲线拟合,并与基于最小二乘的曲线拟合结果进行比较．结果表明,高阶模糊推理系统比基于最小二乘的曲线拟合具有更强的非线性处理能力,更适用于曲线拟合． 相似文献
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In evaluating the relationship between two measures across different groups (i.e., in evaluating “differential validity”) it is necessary to examine differences in correlation coefficients and in regression lines. Ordinary least squares (OLS) regression is the standard method for fitting lines to data, but its criterion for optimal fit (minimizing the squared vertical distances between the points and the line) is less natural in many contexts than the criterion used in orthogonal regression (minimizing the squared Euclidean distances of points from the line). OLS regression is appropriate if the goal is to predict some unknown dependent variable from a known independent variable, but in examining the relationship between two variables, which both contain error, OLS regression introduces bias. This bias, associated with regression toward the mean, can suggest that the test scores have different relationships, and therefore different meanings, in two groups, when the two sets of test scores have the same relationship and the same meanings in the two groups. The impact of regression toward the mean in differential validity studies is illustrated with two synthetic and two real data sets. Each of the two real data sets include two measures of competence in applying legal principles to fact situations (an essay test and a multiple-choice test) for candidates in two groups (Black/White in the first example and women/men in the second example). 相似文献
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房思钊 《山东教育学院学报》2011,26(2):120-123
指挥的职责是带领合唱队去完成合唱作品所赋予的使命。合唱指挥与队员的交流主要是通过视觉信息传递的,指挥把内心的语言和情感转化为视觉信息传达给队员,从而形成了指挥的视觉行为,即指挥手势。指挥手势的优劣不仅直接影响到作品的质量,还对听众在艺术鉴赏与艺术评价上形成导向,重视指挥的手势并视其为合唱整体中不可分割的重要部分,对于合唱指挥爱好者来说至关重要。本文从指挥的任务、指挥的功能、指挥的意识和表现形态为前提,结合力学原理和美学原理,浅论构成指挥手势的要素——点和线以及获点位置、获点角度、线的差异等对合唱指挥视觉艺术的影响。 相似文献
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For reconstructing a freeform feature from point cloud, a deformation-based method is proposed in this paper. The freeform feature consists of a secondary surface and a blending surface. The secondary surface plays a role in substituting a local region of a given primary surface. The blending surface acts as a bridge to smoothly connect the unchanged region of the primary surface with the secondary surface. The secondary surface is generated by surface deformation subjected to line constraints, i.e., character lines and limiting lines, not designed by conventional methods. The lines are used to represent the underlying information of the freeform feature in point cloud, where the character lines depict the feature＇s shape, and the limiting lines determine its location and orientation. The configuration of the character lines and the extraction of the limiting lines are discussed in detail. The blending surface is designed by the traditional modeling method, whose intrinsic parameters are recovered from point cloud through a series of steps, namely, point cloud slicing, circle fitting and regression analysis. The proposed method is used not only to effectively and efficiently reconstruct the freeform feature, but also to modify it by manipulating the line constraints. Typical examples are given to verify our method. 相似文献
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试析地方政府绩效评估及其实践 总被引：2，自引：0，他引：2
在当代政府改革的浪潮中，政府绩效评估在世界各国备受重视。政府绩效评估的内涵包括经济、社会、政治等方面。政府绩效评估在世界上已经成为一种不可逆转的趋势，而我国地方政府绩效评估面临价值、理念、制度、技术等方面的问题与困难，需要不断探索并借鉴别国经验，在实践中不断完善。 相似文献