The King's Fund said the Department of Health data was not perfect but warned the variations in spending were too big to be ignored.

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Social data is not a perfect measure by any means, but it does do a surprisingly effective job of revealing mass preference.

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It supplies the user interface, but is otherwise stateless, and may not even store any data, perfect for task workers.

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Both of these facts, consistent overlap with occasional errors of the same magnitude, would lead me to believe that the data on Russian production, while not perfect, is reasonably accurate and reliable.

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Not encouraging data points, but the perfect ingredients for a multinational, large-cap bull run.

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This calculation is not a perfect apples to apples comparison using the same data source for both sales periods.

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WMAP's data are in close agreement with this model, but that agreement is not perfect.

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