Create a data frame with just the variables in the formula in
This is comparable to
model.frame except that factors,
polynomials, transformations, etc. are not expanded.
An object returned by
Boolean indicator of whether or not to include the variable(s) on the left-hand side of the model formula.
This is an easy-to-use substitute for
subset arguments, if present in
lmobj's call, affect the result appropriately.
A data frame containing each of the variables referenced in the model formula.
Russell V. Lenth
Lenth RV (2009) “Response-Surface Methods in R, Using rsm”, Journal of Statistical Software, 32(7), 1–17. http://www.jstatsoft.org/v32/i07/.
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