参考资料

[1]     盛骤, 谢式千,潘承毅.概率论和数理统计[J]. 2001.

[2]     https://en.wikipedia.org/wiki/Maximum_likelihood

[3]     https://www.youtube.com/watch?v=fvNUUJuFXM0

[4]     https://en.wikipedia.org/wiki/Independent_and_identically_distributed_random_variables

[5]     http://www.cnblogs.com/liliu/archive/2010/11/22/1883702.html

最大似然估计（Maximum Likelihood Estimation）