[Stanford] Introduction to Statistical Learning WK#3讨论作业帖

第三周课程已经可以看来，欢迎大家讨论交作业！

等结果的同时提升自己！

最后一题尼玛想多了。。。

交作业啦~~~第三周~还算早~

第三周了，大S的两位大大幽默依旧，讲得倒是挺好的，只是这周的作业题依然不怎么难哇。。。

觉得有空得自己再去看看其他相关的书呢。。。

week3:最后一张PPT总结得好。

赶着这周的尾巴交作业QAQ

Still have some confusions...   

caomengchu 发表于 2014-2-11 22:43
Still have some confusions...

welcome to discuss in here

4.8 Which of the following statements best explains the relationship between Quadratic Discriminant Analysis and naive Bayes with Gaussian distributions in each class?

Quadratic Discriminant Analysis is a more flexible class of models than naive Bayes Status
Quadratic Discriminant Analysis is a less flexible class of models than naive Bayes
Quadratic Discriminant Analysis is an equivalently flexible class of models to naive Bayes For some problems
Quadratic Discriminant Analysis is more flexible than naive Bayes, for others the opposite is true.

解释：With Gaussian distributions, naive Bayes is equivalent to Quadratic Discriminant Analysis with the additional requirement that each class covariance matrix Σk be diagonal. Thus, Quadratic Discriminant Analysis is more flexible.
但是木有看懂。。。哪位牛牛可以再解释一下？

交作业~~~~~~