joint probability density function

例句：

1. 1. The joint probability density function is used to model the joint distribution of two random variables.
   联合概率密度函数用于模拟两个随机变量的联合分布。
2. 2.In this study, we use the joint probability density function to analyze the relationship between temperature and humidity.
   在这项研究中，我们使用联合概率密度函数来分析温度和湿度之间的关系。
3. 3. The joint probability density function is a crucial tool for understanding the behavior of complex systems.
   联合概率密度函数是理解复杂系统行为的关键工具。