A logical value. This indicates whether to record this
code step. The default is TRUE. It should remain TRUE unless this
function is used as a wrapper in other code.
Definition of <em>treatment</em>
The word treatment is sometimes used to refer to one of these variables.
When there are more than one treatment variables then this unfortunately
confuses whether treatment refers to the variable or the combination of
all treatment variables.
Treatment is the whole description of what is applied in an experiment.