统计分析函数：CA,CRAMER,LR,MA,MK,MTT,YAMA-Statistical analysis function: CA, CRAMER, LR, MA, MK, MTT, YAMA

t-统计方法，常用于分析气象要素的突变，例如降水、温度-t- statistical methods used to analyze mutations of meteorological factors, such as precipitation, temperature, etc.