Description Usage Arguments Value Methods (by class) Note See Also Examples
Computes a factor that has a level for each combination of the factors 'fac1' and 'fac2'.
1 2 3 4 5 6 7  crossFactors(x, fac2 = NULL, ...)
## Default S3 method:
crossFactors(x, fac2 = NULL, ...)
## S3 method for class 'formula'
crossFactors(formula, fac2 = NULL, data = NULL, ...)

x 
the name of the first factor or a formula in the form 
fac2 
the name of the second factor  ignored if 
... 
Optional arguments 
formula 
a formula in the form 
data 
an optional data frame in which to evaluate the formula 
Returns a vector containing the factor which represents the interaction of the given factors.
default
: Crossed Factors
formula
: Crossed Factors
This function actually returns a factor
now instead of a character string, so coercion into a factor
is no longer necessary.
1 2 3 4 5 6 7 8 9  ## arousal data:
data(arousal.df)
gender.picture = crossFactors(arousal.df$gender, arousal.df$picture)
gender.picture
## arousal data:
data(arousal.df)
gender.picture = crossFactors(~ gender * picture, data = arousal.df)
gender.picture

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