We did customer survey in last fall from which we know how different stratas answer to survey questions. We did notice that amongst many strata having younger people who move often the non-response rate was much higher than amongst more established of our customers.
Original survey was based on simple random sampling without replacement amongst strate and sample sizes strata-wise were based on proportional allocation.
Should we use this information next time when we do customer survey? Should we allocate more for those strata which have more non-response. We could perhaps use some re-weighting to correct marginal distributions afterwards.
Could this be reasonable approach?
We have not done customer surveys earlier ourselves and previous survey was financed together with our industry association and we got only summary statistics. And survey was done by outside consultant firm. So we do not have any technical reports what they had actually done in that survey.