What problem does it solve? Measuring the return on investment of influencer marketing campaigns is difficult because value comes from multiple sources: direct sales, earned media, and long-term customer value. This Skill provides structured methodologies to calculate, compare, and communicate campaign ROI to stakeholders. ## Core Features & Use Cases - Multiple ROI Methodologies: Computes direct ROI, ROAS, earned media value (EMV), cost efficiency metrics (CPM, CPE, CPA, CAC), and LTV-based ROI. - Attribution Modeling: Applies first-touch, last-touch, linear, time-decay, and position-based attribution to allocate revenue across influencers. - Influencer-Level Analysis: Ranks individual influencers by ROI, ROAS, and budget efficiency, segmented by tier (macro, micro, nano). - Use Case: Given a $25K campaign that generated $72K revenue and 2.1M reach, produce a full ROI report showing 188% ROI, 2.88:1 ROAS, EMV estimates, and an executive-ready summary with recommendations. ## Quick Start Calculate the ROI for my influencer campaign with a $25,000 budget that generated $72,000 in revenue and 2.1 million reach.