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Mathematical collocations

There is a phrase people use when talking about statistics that really bugs me. It's "non-parametric data". I see it all the time in statistical teaching materials and I hate it because I know what they mean, but what they've said is simply wrong. Whoever writes this phrase has a tenuous grasp of what the word non-parametric means. If they really understood what it meant, they would realise that the word non-parametric can only be used to apply to a statistical procedure, not to the data itself; the words "non-parametric" and "data" just can't be put together like that.

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