The effect of selection was closely related with parent characteristics. The effect of different selection methods to select protein content varied with cross types.

选择效果与亲本特点有密切关系，不同选择方法对蛋白质含量的选择效果因杂交组合类型不同而异。

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Vintage players tend to be good, because of a selection effect: If you use a cane and still have a job in the major leagues, it's usually because you can play.

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Mr Heckman confronted the sample-selection problem: in terms of the examples just given, for instance, the effect on the results if the workers who answered the questionnaire differed in important ways from those who did not.

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But both the selection bias and regular-phone-use definition might be expected to mask any adverse effect of phones.

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