Why consistent user IDs matter in experiments
WHAT IT TESTS: understanding identity for stable assignment and clean measurement. OUTLINE: the user id seeds deterministic bucketing and ties events to one person across devices; achieve it via authenticated ids and anonymous-to-known stitching.
WHAT IT TESTS: whether you grasp why a stable identity underpins valid experiments. ANSWER OUTLINE: the user id is hashed to deterministically assign a variant, so the same user always sees the same experience, and it links all their events for correct conversion attribution. Inconsistent ids across devices or sessions split one person into many, causing flickering variants and inflated counts.
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- #identity
- #user-id
- #experimentation
- #assignment
- #attribution
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