multivariate trace statistic是什么意思

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kanlinzon 共回答了34个问题 | 采纳率82.4%: 　　multivariate trace statistic
　　多元统计跟踪; 1年前

求翻译multivariate logistic regression analysis using a stepwis 求翻译multivariate logistic regression analysis using a stepwise backward metod 怎么翻译 1.multivariate logistic regression analysis using a stepwise backward metod 2.Multiple logistic regression 3.cox regression model 4.erosive gastritis 高密付1年前2: ship0o0 共回答了23个问题 | 采纳率82.6%

1.多元逻辑回归分析使用了逐步向后的方法
2.多元逻辑回归
3.cox回归模型
4.糜烂性胃炎

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一道英文概率题 X and Y have a multivariate discrete distribution wi 一道英文概率题 X and Y have a multivariate discrete distribution with the probability function f(X,Y) where f(-1,1) = f(0,0) = f(1,1) = 1/3.What is the correlation coefficient between X and Compute the marginal density,fx(1) of X when it equals 1.Similarly compute fy(1).Does f(1,1) = fx(1)fy(1) Use this example to outline the relationship between correlation and independence. 暗黑原力1年前1: 臣以讨贼共回答了20个问题 | 采纳率85%

1.先算出 mean of X and mean of Y:m(X)=1/3(-1+0+1)=0; m(Y)=1/3(1+0+1)=2/3
2.计算Covariance(X,Y)=(1/3)(-1)(1-2/3)+(1/3)(0)(0-2/3)+(1/3)(1)(1-2/3)=0,所以推出correlation coefficient is 0
3.fx(1)=1/3; fy(1)=2/3; However,1/3=f(1,1) 不等于 fx(1)fy(1)=2/9 从而推出X,Y are NOT independent.
This example shows us that uncorrelation does not imply independence.

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