Whether you are concerned with strict statistical representation, enhanced sample productivity, or a fair balance of both we have a solution for you! And, our customizable list of options including stratification, working block screening rate, record code appending, frame element suppression, etc. is state-of-the-art.
- Overview of RDD & its use
- EPSEM (Type A) – Pure probability/highly representative
- Weighted (Type B) – More Efficient
- Two-stage designs
- Cell phone\wireless
- RDD run-time options
Good RDD samples begin with careful attention to the fundamentals, which means building the most accurate sampling frame ... updating it constantly … and thinking about the samples to be run in an old-fashioned, academically-oriented way.
Since we run thousands of samples for hundreds of researchers each year, our professional staff can make an important contribution to help you decide which type of RDD sample is best suited for your needs.