[R] Specify model with polynomial interaction terms up to degree n

YTP cprice at gmail.com
Mon Jul 2 15:29:45 CEST 2012


I would like to specify a model with all polynomial interaction terms between
two variables, say, up to degree 6. For example, terms like a^6 + (a^5 *
b^1)  +  (a^4 * b^2) + ... and so on.  The documentation states

The ^ operator indicates crossing to the specified degree.

so I would expect a model specified as y ~ (a+b)^6 to produce these terms.
However doing this only returns four slope coefficients, for Intercept, a,
b, and a:b.  Does anyone know how to produce the desired result? Thanks in
advance.

--
View this message in context: http://r.789695.n4.nabble.com/Specify-model-with-polynomial-interaction-terms-up-to-degree-n-tp4635130.html
Sent from the R help mailing list archive at Nabble.com.



More information about the R-help mailing list