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How accurate is the impression reporting?

When visitors use some kind of ad blocking software on their computers and see the web pages but no ad. This does NOT count as impressions in our system because an impression is counted not when the serving code is served but when a tracking image is successfully loaded. Ad blockers are designed to prevent images from loading and therefore the tracking image would not be requested from the visitor computer.

There might be discrepancies between the numbers reported by our system and other systems. Our unique impression number is defined as per visitor (IP address) per ad within 24hrs. For other system, it might be per visitor within a time interval (might be some period other than 24-hr)

Detailed Visitor Profiles

For all reports with detailed visitors info (including Geographical, IP addresses, etc.), the reports use statistics samplings and do not include all visitors in the specified time-frame. It means our system collects a huge amount of data daily (millions visitors per day every day) and randomly reduces it down (by selecting at random) to a smaller/manageable size and produce the graphical report you see in real-time.

Since we want to provide clients with real-time stats or with little delay, maintaining all full data for each visitor will slow down the system significantly and will only provide a small gain in knowledge. Currently, each ad will maintain up to 1000 detailed visitor profiles. As more recent visitors come in, older data will be replaced by newer one.

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