NEW YORK--(BUSINESS WIRE)--Maintaining its commitment to the highest quality in online research, GfK will increase the size of KnowledgePanel® by a third in 2013. Now in its 15th year, KnowledgePanel ...

KnowledgePanel’s point estimates better matched national benchmarks even before poststratification weighting. Correlations between PROMIS measures and age and income were similar in MTurk and ...

Researchers have many options for web-based survey data collection, ranging from access to curated probability-based panels, where individuals are selectively invited to join based on their membership ...

In the US, Ipsos has acquired GfK's probability-based online panel, for an undisclosed sum, and added it to the Ipsos Public Affairs division. In October, Ipsos completed the acquisition of four ...