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I've collected few sets of data and obtained significant different linear regression (R^2) in 2 particular sets of data .

Does that indicates the 2 sets of data is not validated which might due to data collection error?

For example, 20 sets of data contain linear regression of 0.900+ (0.994, 0.983, 0.932...), while the 2 sets of data contain linear regression of 0.720 and 0.810 respectively.

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# I Linear regression on data collection error

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