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naclonly木虫 (小有名气)
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[求助]
数学公式表达，求助
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naclonly: 金币+5, 翻译EPI+1, ★有帮助 2012-08-06 21:10:23
爱与雨下: 金币+1 2012-08-08 19:45:25
sltmac: 金币+15 2012-09-06 09:06:23
naclonly: 金币+5, 翻译EPI+1, ★有帮助 2012-08-06 21:10:23
爱与雨下: 金币+1 2012-08-08 19:45:25
sltmac: 金币+15 2012-09-06 09:06:23
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（1） The coefficient of correlation Calculation formula  自己把公式再写一遍即可）In the formula，Xmk means that the number of the sample is m and the number of the variables is k;Xm(平均值，这里我不方便打出来）on behalf of the mean value of all variables for the m sample;Xrk means the k variables in the common pattern vector;Xr means the total mean value of all variables in the common pattern(k=1,2,3....n);what the correlation coefficient measures is the similarity of the shape in the change pattern of the variables,which is not subject to the effect of variable values and variable unit. (2)the formula of the angle cosine(自己把公式再写一遍） The meaning of the Xmk,Xrk is above.what the cosine measures is the similarity of the shape in the change pattern of the variables.The cosine is closer to the number one, the two vector is similar. 希望能有所帮助 |
2楼2012-08-06 20:31:32
