悬赏 1 个论坛币 已解决
1. Azzalini, A class of distributions which includes the normal ones, Scandinavion journal of statistics, 12, 171-178, 1985.
2. Yu, K. & Jones, M. C. (2004). Likelihood-based local linear estimation of the conditional variance function. J. Amer. Statist. Assoc. 99, 139-144.