| [ QuizWit ] in KIDS 글 쓴 이(By): guest (aaa) <magicall2.dacom.> 날 짜 (Date): 2000년 4월 12일 수요일 오후 05시 52분 18초 제 목(Title): [질문]문제 좀 풀어주세요. Let the joint pdf of the two random variable U,V be f_UV(x,y)= beta_nki (2F(x)-1)^(i-1) * (F(y)-F(x))^(k-i-1)* (1-F(y))^(n-k) * f(x)f(y) (y>x>0) and 0 otherwise, where n,k, and i are integers with n>=k>i>=1, and F and f are the cdf and pdf of random variable, respectively 1. Determine beta_nki 2. Find the pdf of U 3. Find the pdf of V 4. Calculate E{- f'(U)/f(U)} when f(x)=f_L(x)=e^(-1) / (1+e^(-x))^2 5. Calculate E{f''(U)/f(U)} when f(x)=f_L(x) 며칠을 생각해도 도저히 못 풀겠어요.--; |