Factor and Level Names
DESCRIPTION:
Returns or changes the names of the factors and the names of the levels of the factors.
USAGE: 
factor.names(design)


factor.names(design) <- values
REQUIRED ARGUMENTS:
design:
a design or data frame.
Missing values (NA) are allowed.
OPTIONAL ARGUMENTS:
values:
either a list, similar to the returned value of factor.names, or a vector, to be used as the names of the factors. In the second case, the factor levels will default as below.
VALUE:
a list, whose "names" attribute contains the names of the factors in the design, and whose elements are the levels for the corresponding factors. Defaults will be produced wherever necessary: the factor names default to etc. The levels default to abbreviated factor names, with etc. pasted on.
SIDE EFFECTS:
when used on the left side of an assignment, takes and coerces them to the form just described, using the default rules.
SEE ALSO:
fac.design , oa.design , design , design.object , aov .
EXAMPLES: 
factor.names(catalyst)


des.1 <- fac.design(c(2,3), rep=2)
factor.names(des.1) <-  c("Gender", "Treatment")
# changes level names to Gndr1 and Gndr2, and Trtm1, etc.