Abstract: A system includes a hardware processor and a memory storing software code for controlling distribution of ad surveys to target audiences. For each target audience, the hardware processor executes the software code to receive ad data describing an ad volume distributed to the target audience during a predetermined time interval of an ad campaign, and to receive survey data describing a survey volume distributed to the target audience and a survey response volume collected from the target audience during the predetermined time interval. The software code also determines a next survey sampling rate for the target audience based on the ad data and the survey data, such that the volume of survey responses collected from the target audience during matches an ad distribution volume for the target audience within a predetermined threshold during each predetermined time interval of the ad campaign.