Interactive publication
Back to the catalogueTemporalCase 02 of 10
Crosswalk vintage arm-flip
Geolocation databases update weekly; a network block whose location estimate crosses an experiment arm boundary between releases flips every device behind it between arms mid-flight — differential contamination no deattenuation corrects.
Class
Case to account for
Affects
1 conversion
01
Detection
Diff block→cell assignments across successive db vintages against the assignment partition.
02
Mitigation
01
Pin the db vintage for the assignment period
02
Re-pin only at period boundaries
03
Count, report, and exclude flipped blocks from analysis
03
Affected conversions
IP lookupH3 (probabilistic crosswalk)
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