[R] Surprising Symbolic Model Formula Evaluations

Emi Tanaka dr@em|@t@n@k@ @end|ng |rom gm@||@com
Fri Oct 11 04:06:47 CEST 2019


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.




*Dr. Emi Tanaka* | Lecturer in Statistics

Faculty of Science, School of Mathematics and Statistics

Secretary, NSW Branch, Statistical Society of Australia

Social Media Coordinator, Central, International Biometrics Society

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

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