In case of conditional heteroskedasticity, we might have 【图片】. But with the heterokedasticity consistent estimator proposed by White (1980), we can estimate consistently estimate【图片】 for t = 1, 2, · · · , n.
【简答题】阅读理解。 I'm a school girl. My brother and I are twins. We are both at school. We like school. My parents are both teachers. They work hard. My brother and I study at No. 1 Middle School. There are twent...
【简答题】看图选词完成短文。 friend, eight, brother, His, robot, My, is, Paul Paul I am 1______________. I am 2______________. 3______________ father is a fireman (消防员). My mother 4______________ a nurse (护士). I have on...
【简答题】选词填空,完成下列短文。 fly restaurant likes have theatre On Sundays, my father, mother, brother and I often ____________ fun together. In the morning, we go to the ____________ to watch a movie,...