Hi, I'm wondering about some logics behind the following simplifications:
y ~ 1:x simplifies to y ~ 1 y ~ x:1 simplifies to y ~ 1 y ~ x*1 simplifies to y ~ x y ~ 1*x simplifies to y ~ 1 Mainly I would have expected y ~ 1:x to simplify to y ~ x and the cross operator to be invariant to order. I have some further surprising cases below that I'd also like to know more about but just above will also be great. https://rpubs.com/emitanaka/unexpected-formula-eval Best, Emi *Dr. Emi Tanaka* | Lecturer in Statistics Faculty of Science, School of Mathematics and Statistics Secretary, NSW Branch, Statistical Society of Australia <https://www.meetup.com/NSW-Branch-of-the-Statistics-Society-of-Australia/> Social Media Coordinator, Central, International Biometrics Society <https://twitter.com/IBSstats> *THE UNIVERSITY OF SYDNEY* 827, Carslaw F07 | The University of Sydney | NSW | 2006 *Phone:* +61 2 9351 3039 *Website:* * <http://sydney.edu.au/>*https://emitanaka.github.io/ *Twitter: *@statsgen CRICOS 00026A This email plus any attachments to it are confidential. Any unauthorised use is strictly prohibited. If you receive this email in error, please delete it and any attachments. Please think of our environment and only print this e-mail if necessary. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
