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向量是近代数学中最基本最重要的概念之一,它具有丰富的实际背景和广泛的应用功能,因此,将平面向量的知识引入中学数学以后,极大的丰富了中学数学思想方法,如课本中用向量法证明正弦定 相似文献
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Quadratic radical function better than fisher z transformation 总被引：1，自引：0，他引：1
A new explicit quadratic radical function is found by numerical experiments, which is simpler and has only 70.778% of the maximal distance error compared with the Fisher z transformation. Furthermore, a piecewise function is constructed for the standard normal distribution： if the independent variable falls in the interval （-1.519, 1.519）, the proposed function is employed; otherwise, the Fisher z transformation is used. Compared with the Fisher z transformation, this piecewise function has only 38.206% of the total error. The new function is more exact to estimate the confidence intervals of Pearson product moment correlation coefficient and Dickinson best weights for the linear combination of forecasts. 相似文献
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