fac.combine {dae}  R Documentation 
Combines several factors into one
Description
Combines several factors
into one whose levels
are the
combinations of the used levels
of the individual factors
.
Usage
fac.combine(factors, order="standard", combine.levels=FALSE, sep=",", ...)
Arguments
factors 
A list of factors all of the same length.

order 
Either standard or yates . The order in which the
levels combinations of the factors are to be considered as
numbered when forming the levels of the combined factor ;
standard numbers them as if they are arranged in
standard order, that is with the levels of the first factor moving slowest and
those of the last factor moving fastest; yates numbers them as if they
are arranged in Yates order, that is with the levels of the first factor moving
fastest and those of the last factor moving slowest.

combine.levels 
A logical specifying whether the levels
labels of the new factor are to be combined from those of the
factors being combined. The default is to
use the integers from 1 to the product of the numbers of combinations
of used levels of the individual factors , numbering the levels
according to order .

sep 
A character string to separate the levels when
combine.levels = TRUE .

... 
Further arguments passed to the factor call creating
the new factor .

Value
A factor
whose levels
are formed form the observed
combinations of the levels
of the individual factors
.
Author(s)
Chris Brien
See Also
fac.uncombine
, fac.split
, fac.divide
in package dae.
Examples
## set up two factors
A < factor(rep(1:2, each=6))
B < factor(rep(1:3, each=2, times=2))
## obtain sixlevel factor corresponding to the combinations of A and B
AB < fac.combine(list(A,B))
[Package
dae version 3.213
Index]