Our best tool for ensuring a representative sample is the voter file — the list of registered voters that we use to conduct our survey. This is a lot more than a list of phone numbers.

For example, a nationally representative sample of 1,000 Americans wouldn’t include enough people to support reliable estimates for many small groups, such as Muslims or Korean Americans. One way to ...

A recent study from the MRS Representation in Research steering group found no cost penalty or negative impact on research results when inclusive parameters are included in nationally representative ...

Data sets used to construct a credit-scoring model are always imbalanced in the real world, leading to the recognition ability of the model becoming biased toward the majority and low-risk samples and ...