comparison

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comparison

the basis of analytical epidemiology, the statistical comparison between groups.

comparison groups
the groups between which a statistical comparison is to be made.
comparison population
the population in which a comparison between groups is to be conducted. All of the groups to be used comprise the population.
References in classic literature ?
But when I saw these sleek, shiny carcasses shimmering in the sunlight as they emerged from the ocean, shaking their giant heads; when I saw the waters roll from their sinuous bodies in miniature waterfalls as they glided hither and thither, now upon the surface, now half submerged; as I saw them meet, open-mouthed, hissing and snorting, in their titanic and interminable warring I realized how futile is man's poor, weak imagination by comparison with Nature's incredible genius.
If Richelieu made the king, by comparison, seem small, he made royalty great.
It was like coming out into sunlight by comparison with the misty blackness which had been around them.