Alias Method for Design Objects

DESCRIPTION:

Returns the alias pattern from a design object.

USAGE:

alias.design(object, formula= ~ ., ...) 

REQUIRED ARGUMENTS:

object
design object.

OPTIONAL ARGUMENTS:

formula
formula giving the model to test for aliasing. This defaults to fitting the non-factor variables to the model .^2; i.e., all main effects and second-order interactions.
Arguments for function can also be supplied to this function.

VALUE:

the alias object corresponding to fitting a model as specified.

DETAILS:

This function is a method for the generic function for class design. It can be invoked by calling for an object x of the appropriate class, or directly by calling regardless of the class of the object.
A formula is needed if you want a non-default model, and always if there are covariates you want to include in the model. The formula need not have a left side; an artificial response will be used. The numerical result does not depend on the value of the response, but interpretation of . in the formula does, so if you want a non-factor to be excluded from a formula using ., it should be in the response.

SEE ALSO:

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