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Why do we bother with correlations at all?
Given the problems with interpreting correlational data, one might reasonably ask: why do we bother with them at all if it is a causal relationship that we seek? Why not just gather data that could provide a more definite answer, or otherwise just ignore correlations?
The reason is pragmatism.
Correlational data are usually relatively easy and inexpensive to obtain, at least in comparison to experimental data.
Also, many cause-effect relationships are so subtle that we often first learn of them through correlations detected in observational data.
That is, they are often useful.
所以,不要总拿西医里面的很多相关性研究说事。这种相关性的研究通常只是任何一个真正医学科学研究的基础部分。
打一地名 发表于 2013-8-15 16:31
以后还是别认真地跟一个疯子论理了,不然别人还以为你跟他一个智商。不小心遇上的时候踢上两脚就好了。 |
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