1.估算得到的参数结果为 alpha=0.5,miu=[-2.99272606292368,-4.99385212246689]
[0.980325315994807,1.98584389269297],sigma=[0.902432018597678,0.321272347954999;0.32
1272347954999,2.85674974141440]
[2.12759204786092,0.457901774066577;0.457901774066577,0.933868703603766]
1 1.5 2 2.5 3
5.216
5.218
5.22
5.222
5.224
5.226
5.228
5.23
5.232
5.234
5.236