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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. 

Chris Visscher

Chris Visscher (MSc in Sociology, Radboud University Nijmegen,The Netherlands) has been a principal lecturer on statistics for more than 30 years. He wrote one of the early SPSS syntax manuals for students in 1986. He loves to sing Gregorian chants, in his office, in churches, and occasionally at students’ house parties around 3 a.m.