A summary of ABC News' polling standards and survey methodology follows. ABC News maintains standards for disclosure, validity, reliability and unbiased content in survey research and evaluates ...

Survey methodology encompasses the systematic approach to designing, administering and analysing surveys to ensure reliable and valid data. Central to this discipline is the optimisation of response ...

This report presents estimates of the number of unauthorized immigrants in the United States as of July 2023 and for earlier years. As noted earlier in this report, the estimates presented here ...