Click through rates are used to optimise yield from ad creatives. CTR scores are recalculated every 10 minutes (on average). This ensures your Cxense Ad platform is dynamically balancing the affect of each Ad's relevance to the audience.
Click data for each creative belonging to an advertisement in an AdSpace is used to determine the ranking of the creative. By dynamically selecting the highest-ranking creative for display, yield will be optimised - note this is an automated process of your Ad Platform. No manual intervention is necessary to achieve this. In addition to continual recalculation of CTR scores, your platform also utilizes Flighting (ref: beta randomized CTR).
Product Yield is of course affected by your Cost Models selected on your Products.