Versta Research Post

Research Good Enough for Judicial Review

I recently came across this strange big book, the Reference Manual on Scientific Evidence, compiled by the Federal Judicial Center and the National Research Council.  It’s not fun reading, but it provides an enormously useful and fascinating overview of what makes social and marketing research (and other kinds of scientific research, too) sufficiently rigorous to…

How to Succeed with Biased Samples

How to Succeed with Biased Samples

Leading practitioners of survey research now agree that online polling and other forms of non-probability sampling can work.  The key is to give careful attention to the survey protocols, data collection, cleaning, and back-end weighting so that ultimately the sample being analyzed matches the population you want to know about in as many relevant ways…

Versta Research Post

Polling Group Gives Nod to Online Surveys

The purists in the polling industry who have always insisted that only probability sampling is valid may finally be accepting that their methods are dead. This is one happy conclusion I draw from the debate over AAPOR’s recent task force report on non-probability sampling, which is nicely summarized (and debated) as the lead article of…