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本文提出了一个在正态分布中进行一定比例的截尾选择的选择强度计算公式。其与真值的偏差小于0.004。选择强度(i)是预测遗传增益的一个重要因子。育种工作者常用标准截尾正态分布的平均数来估计选择强度,选择率(p)则相当于正态曲线下所截取的百分数面积。这两者都可从表中查出(如Lindgren和Nilsson1985)。但在某些研究中,选择率的积分运算既无表可查,亦无精确易行的方法可用,因此,有必要设计一种方法,使得在计算机或可编程序计算器上每给出一个p值,就可得出相应的i。列出公式:
In this paper, we propose a formula to calculate the selection strength of a certain percentage of censored choices in normal distribution. Its deviation from the true value is less than 0.004. The choice of intensity (i) is an important factor in predicting the genetic gain. The breeders often use the average of the normalized censored normals to estimate the choice strength, and the selectivity (p) corresponds to the percent area taken under the normal curve. Both can be found in the table (eg Lindgren and Nilsson 1985). However, in some studies, the integral operation of selection rate is neither table-based nor accurate and easy to use. Therefore, it is necessary to devise a method that makes it possible to assign a value to a computer or a programmable calculator p value, you can come to the corresponding i. List the formula: