除了归因，还有什么方法可以用来分析媒体的投资回报率 (ROI)？

Marketing Mix Modeling (MMM) is a top-down statistical analysis that uses historical data to quantify the impact of various marketing and non-marketing factors on sales or other key performance indicators. It helps determine the ROI of different media channels by isolating their individual contributions, even in the absence of user-level tracking. Smart Bidding is an optimization tool, not an analysis method for ROI. Conversion Lift measures the incremental impact of an ad campaign on conversions, which is a component of ROI analysis but not a standalone method for overall media ROI. CPM (Cost Per Mille/Thousand Impressions) is a pricing model, not an ROI analysis method.