CreativeRotationWeightStrategy

Enums
WEIGHT_STRATEGY_EQUAL The creative weights should all be equal to 1. This is the default value for all ads with a rotation type of Random.
WEIGHT_STRATEGY_CUSTOM The creative weights can be any user provided positive integer.
WEIGHT_STRATEGY_HIGHEST_CTR The weights will be automatically calculated giving preference to the creative that has the highest CTR. The CTR for campaigns that are optimized for clicks = clicks/impressions. The CTR for campaigns that are optimized for view-through or click through is sum(activities + floodlight weight)/impressions.
WEIGHT_STRATEGY_OPTIMIZED The creative weights will be automatically calculated using a formula that could not possibly be explained in these comments. The value will be within some predetermined range (probably 0 - 1,000,000).