Joseph Berkson, the longtime head of the medical statistics division at the Mayo Clinic, observed in 1938 that correlations can also arise from a common effect.

约瑟夫·伯克逊，长期担任Mayo诊所的医学统计部领导，他在1938年发现共同的影响也可以导致相关性。

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National police commissioner Bheki Cele said Mr Wright had "admitted to harbouring and interviewing Mr Pavlos Joseph at a time when the police were searching for the latter in order to effect an arrest".

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