Glitches happen, and this one illustrates how rankings with big differences in spam volume are robust anyway. A format change in an ancillary data source detected through consistency checks caused recomputations in selected rankings for September, October, and November 2013 in Classic. (Cloud. was unaffected). The old versions are preserved as v1 rankings, and the … Continue reading Recompute Fall 2013 on SpamRankings.net