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In observance of the 2024 holiday season, Sage offices will be closed Monday December 23rd through Wednesday January 1st. Normal operations, including shipping for orders placed during the closure, will resume on Thursday January 2nd. For technical support during this time, please visit our technical support page for assistance options. 

We wish you a wonderful holiday season. Thank you. 

Johnny Blair Independent Consultant, USA

Johnny Blair is an independent consultant. Previously, he was a principal scientist and senior survey methodologist at Abt Associates Inc., where he directed the Cognitive Testing Laboratory. He has conducted research on sampling rare populations, measurement error in proxy reporting, and cognitive interviewing for pretesting survey instruments. He has been a member of the Design and Analysis Committee, which provides statistical advice for the National Assessment of Educational Progress (NAEP), often referred to as The Nation’s Report Card. He has served on National Research Council panels to assess major government-sponsored surveys. His research publications include many book chapters and over 50 articles in academic journals and in the Proceedings of the Joint Statistical Meetings of the American Statistical Association Section on Survey Methods. He served two terms on the editorial board of Public Opinion Quarterly and is a frequent peer reviewer for several other research journals.