starflyyy的博客

How the choose the features?怎样选择特征?construct a multivariate linear model using all the provided features and choose those with 0.001 significance level(or 0.01, 0.05 significance level)使用所有的特征建立多元...

文章目录两个分布$chi^2$分布t分布三个关键点一个重点式子t-检验两个分布chi2chi^2chi2分布设独立同分布的随机变量X1,X2,...Xn∼N(0,1)X_1, X_2, ...X_n \sim N(0, 1)X1​,X2​,...Xn​∼N(0,1)令X=∑i=1nXi2(1)X = \sum\limits_{i = 1}^{n}X_i^2 \qquad (1)X=i=1∑...