Classify variables by causal role in an adjustment problem.
Campaign -> product demo -> qualified pipeline. Sort each variable by role for estimating campaign effect on qualified pipeline. Confounder Mediator Collider or selection flag Instrument candidate Outcome Baseline account size measured before campaign assignment Product demo booked after campaign exposure Escalated lead review triggered by both high lead score and rep attention Randomized send-time batch that changes exposure but not buyer intent directly Qualified pipeline created within 45 days Industry segment used by marketing to choose campaign eligibility Number of sales follow-ups caused by campaign response Only leads accepted by sales after campaign and lead-score review
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