Skip to content
Prev 298882 / 398503 Next

Specify model with polynomial interaction terms up to degree n

YTP 
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.

Thread (15 messages)

YTP Specify model with polynomial interaction terms up to degree n Jul 2 David Winsemius Specify model with polynomial interaction terms up to degree n Jul 2 David Winsemius Specify model with polynomial interaction terms up to degree n Jul 2 Bert Gunter Specify model with polynomial interaction terms up to degree n Jul 2 Rui Barradas Specify model with polynomial interaction terms up to degree n Jul 2 YTP Specify model with polynomial interaction terms up to degree n Jul 2 YTP Specify model with polynomial interaction terms up to degree n Jul 2 David Winsemius Specify model with polynomial interaction terms up to degree n Jul 2 YTP Specify model with polynomial interaction terms up to degree n Jul 2 Rui Barradas Specify model with polynomial interaction terms up to degree n Jul 3 YTP Specify model with polynomial interaction terms up to degree n Jul 7 Peter Ehlers Specify model with polynomial interaction terms up to degree n Jul 7 Rui Barradas Specify model with polynomial interaction terms up to degree n Jul 8 YTP Specify model with polynomial interaction terms up to degree n Jul 10 William Dunlap Specify model with polynomial interaction terms up to degree n Jul 10