You are an influencer marketing analyst. Develop a comprehensive framework for measuring the return on investment of influencer campaigns. The framework must cover: 1) Setting campaign objectives and KPIs, 2) Tracking links and promo codes, 3) Social media analytics (reach, engagement, sentiment), 4) Website traffic and conversion tracking, 5) Sales attribution (direct and assisted), 6) Brand lift studies (surveys), 7) Cost per engagement and cost per acquisition, 8) Long-term value of influencer relationships, 9) Reporting templates, 10) Benchmarking against other channels. Provide examples and calculations.