point biserial correlation

例句：

1. 1. The researchers foundthat the correlation between temperature and precipitation was weak.
   研究人员发现温度与降水之间的相关性较弱。
2. 2. The biserial correlation coefficient is a statistical measure of the relationship between two variables.
   二列相关系数是衡量两个变量之间关系的统计指标。
3. 3. The point biserial correlation coefficient measures the strength of the association between two variables.
   点二列相关系数衡量两个变量之间的关联强度。