Để kiểm định giả thuyết "suất sinh lợi càng cao, rủi ro càng lớn" trong các tài sản tài chính ta có thể sử dụng mô hình nào sau đây? a) ARCH(q)
b) GARCH-M(p, q)
c) TGARCH(p, q)
e) EGARCH(p, q)

Adaylily farm sells a portion of their daylilies and allows a portion to grow and divide. the recursive formula an=1.5(an-1)-100 represents the number of daylilies, a, after n years. after the fifth year, the farmers estimate they have 2225 daylilies. how many daylilies were on the farm after the first year?

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

The width of a rectangle is half as long as the length. the rectangle has an area of 18 square feet. what are the length and width of the rectangle?