Massive group correlation: The Internet now enables low cost, high speed, communication.

人际关系：网络现在能够提供低花费、高速度以及人际交往。

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Ecker found there was a correlation between the severity of a person's autism and the amount of structural difference observed in their brain scans, compared with the control group.

艾克尔发现，与正常控制组相比，一个人自闭症症状的严重程度与大脑扫描中观察到的结构差异的多少存在相关性。

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The inverse correlation that the group calculated between a country's disease burden and the average intelligence of its people is impressive.

研究团队计算出一个国家的疾病负担与它的国民的平均智力水平逆相关，即疾病负担越高，其智力水平就会比较低。

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Furthermore, explains Surowiecki, there was no correlation between the performance of the smartest person in the group and the performance of that group.

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But, after studying a high-tech corporate-services provider, a French grocery group, a German broking house and an American mail-order company, the authors found little correlation between loyalty and profitability.

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Many years ago Mr. Dunbar famously noticed that there is a tight correlation between the size of a primate's brain and the size of the social group its species generally forms.

WSJ: The Social Network and the Dunbar Number | Mind & Matter