The pursuit of reliable ways to measure web traffic has come a long way from web counters and hit counts, but standardized, independent traffic figures are still on shaky ground.
All major methods of traffic measurement — from internal to external web log analysis, to panel methods and ISP packet-sniffing — are flawed in some aspect.
But major changes may be in the air. Big players ComScore and Nielsen Online — chastened by a bruising confrontation with the Interactive Advertising Bureau over massive discrepancies — submitted to audits and are seeking accreditation by the Media Rating Council. They’re roaring back this year with competing programs that promise to deliver more accurate measurements, as well as steps to come to grips with Web 2.0 features.
My article “Measuring Up: Web 2.0 poses difficulty for site traffickers” sketches the history of web traffic metrics and the state of the art.

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