Online surveys have become the go-to tool for gathering market research insights. They are often seen as a more efficient and cost-effective alternative to traditional methods like telephone surveys. However, online surveys have one potential downside: they may be less effective at reaching hard-to-reach populations. This is because people who are harder to reach are less likely to be found in panel sample. As a result, online surveys may produce a bias against these groups. There are ways to mitigate this problem, such as weighting the data or using quota sampling. Additionally, there may be specialty panels made up of this hard-to-reach population, such as patients with a condition, etc. While these specialty panels are significantly more expensive, they typically have enough of a concentration to allow for a robust sample.