We know that people who consent look different from those who don't consent. When you get local areas for which you need good-quality data, or if you want to now know about a target population—how seniors are impacted or how single parents are impacted by certain things—the cross product, if you like, of that low level of geography and a particular targeted subpopulation requires a higher level of quality of data.
On November 7th, 2018. See this statement in context.