Compute Factor Interactions
Usage
interaction(..., drop=FALSE)
Arguments
...
|
The factors for which interaction is to be computed.
|
drop
|
If drop is TRUE, empty factor levels
are dropped from the result. The default is to retain all
factor levels.
|
Description
interaction computes a factor which represents the interaction
of the given factors. The result of interaction is always unordered.Value
A factor which represents the interaction of the given factors.See Also
factor.Examples
a <- gl(2, 2, 8)
b <- gl(2, 4, 8)
interaction(a, b)