We sample panelists dynamically based on ad exposure within 72 hrs. – 7 days after ad exposure. We can configure conditions such as the recency of exposure, re-contact, and exposure overlap of channels or other campaigns. A pre-campaign and/or post-campaign sampling approach is optional. The control (Non-exposed) survey groups are balanced against the Exposed based on demographics. By having consistent sample sizes by week throughout the campaign period, we also mitigate for any seasonality or PR product but can still look at exposure by frequency. We will only serve a survey to everyone that delivered metering data throughout the campaign.