I am asking this question to help me with this bountied question.
The Wikipedia article for LDA describes three discrimination rules: Maximum likelihood, Bayes discriminant rule, and Fisher's linear discriminant rule.
However, I cannot find any source that specifies what the default
method used for these functions is. So what is the default
method used for these functions? (If you read my bountied question, you'll be able to understand why I'm trying to understand the default