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naclonly: ½ð±Ò+5, ·­ÒëEPI+1, ¡ïÓаïÖú 2012-08-06 21:10:23
°®ÓëÓêÏÂ: ½ð±Ò+1 2012-08-08 19:45:25
sltmac: ½ð±Ò+15 2012-09-06 09:06:23
£¨1£© The coefficient of correlation
Calculation formula×Ô¼º°Ñ¹«Ê½ÔÙдһ±é¼´¿É£©
In the formula£¬Xmk means that the number of the sample is m and the number of the variables is k;Xm(ƽ¾ùÖµ£¬ÕâÀïÎÒ²»·½±ã´ò³öÀ´£©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(×Ô¼º°Ñ¹«Ê½ÔÙдһ±é£©
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.
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