NO.PZ2018122701000027
问题如下：
What are the similarities and differences between POT approach and GEV approach?
选项：
A. They share two parameters but GEV approach has more estimated parameters than POT approach.
B. They share one parameter but GEV approach has more estimated parameters than POT approach.
C. They do not share any parameters, and POT approach has more estimated parameters than the GEV approach.
D. They do not share any parameters, and GEV approach has more estimated parameters than the POT approach.
解释：
B is correct.
考点：extreme value theory
解析：POT方法具有较少的参数，POT和GEV方法共享尾部参数ξ。
两个的scale是不一样的吗？ 不应该share two para吗
