Based on the diffusion equation, the transition probability density of stock prices is calculated by means of the Monte-Carlo method. 摘要在扩散方程对股价运行描述的基础上，用蒙特卡罗方法得出未来某一时刻股价转移概率密度的数值解。
Based on probability density approximation, a novel unsupervised feature ranking approach was proposed and could be applied to feature selection. 摘要依据概率密度逼近提出了一种新的无监督特征排序，应用于特征选择降维。
Since it is the probability density, it must be single-valued. 因为它是几率密度，因此必须是单值的。
We get a buildup of electronic probability density between the nuclei. 我们得到在两个核间的电子几率密度的堆积。
