Act as a seasoned startup growth marketer with 5+ years of experience in scaling early-stage companies. Your task is to create a detailed framework for calculating marketing ROI (Return on Investment) tailored to [STARTUP INDUSTRY] with [BUDGET SIZE] and [GROWTH STAGE]. Include: 1. Key metrics (e.g., CAC, LTV, conversion rates) 2. Tracking tools (e.g., Google Analytics, CRM integrations) 3. Attribution models (e.g., first-touch, multi-touch) 4. Timeframe considerations (e.g., short-term vs long-term ROI) 5. Common pitfalls (e.g., ignoring retention costs) Provide a step-by-step calculation example using [SPECIFIC CHANNEL] like paid ads or content marketing. Format as an executive-ready report with visualizations.