Response Surface Method Factor Objects

DESCRIPTION:

A class of factors that are generated for response surface methods.

GENERATION:

This class of objects are factors in the rsm.design Objects generated by rsm.design. An object of class "rsm.factor" represents a single variable in an rsm.design object.

METHODS:

The class "rsm.factor" has methods for the following generic functions: [ [<- print summary

INHERITANCE:

Class "rsm.factor" does not inherit from any other class

STRUCTURE:

The "rsm.factor" object is implemented as a numeric vector with the following attributes

VALUE:

scale
half the distance between the cube points
center
the average of the cube points
alpha
a scaling constant for the star points
log
a logical value for whether the factor is computed on the log scale

DETAILS:

If x has 3 or 5 unique values the returned value is computed as follows. The cube points, a and b, of the vector x are taken as the second and fourth unique ordered value of x (first and third if there are 3 values). The star points, c and d are the first and fifth unique ordered values of x (first and third if there are 3 values). Then scale = (b-a)/2, center = (a+b)/2, and alpha = (d - "center")/("center" - a).

SEE ALSO:

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