I can't duplicate your examples This is what I see > y ~ 1:x y ~ 1:x Please try again in a vanilla R session, and send a reproducible example. vanilla means start R from the operating system command line with R --vanilla
this prevents any of your initialization files from being loaded. See ?Startup for details. On Fri, Oct 11, 2019 at 1:05 PM Emi Tanaka <dr.emi.tan...@gmail.com> wrote: > > 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. ______________________________________________ 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.
