3 ms·
Option A is absolutely the worst choice. The non-responders have already selected themselves into a non-random set, and making a request to them alters the enti
by aj7 4y ago
Option A is absolutely the worst choice. The non-responders have already selected themselves into a non-random set, and making a request to them alters the entire experiment.
- mlyle 4y ago> The non-responders have already selected themselves into a non-random set Yes, and you're clawing back a non-random portion of that non-random set, which can be expected to improve the sample quality overall.
- pdonis 4y agoWhy would this be expected to improve sample quality? You want a random sample, not a non-random piece of a non-random subset. Non-random sampling just introduces more confounders and makes your sample quality worse.