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Summary boxes inaccurate / change on refresh

If your filter matches more than 1,500 visitors, then we grab a random 1,500 visitors from the pool of matches and extrapolate that out to the full number of visitors that matched the filter. This is for performance reasons.

Because of this, if you refresh the report or come back and do the same filter later, the numbers may be slightly different. After a lot of testing, we found that 1,500 is about right in terms of the tradeoff between speed and accuracy.

There is not currently a way to disable the sampling.