Quadratic Discriminant/Discriminative Analysis (QDA)

• is a variant of LDA in which an individual covariance matrix is estimated for every class of observations
• QDA is particularly useful if there is prior knowledge that individual classes exhibit distinct covariances
• a disadvantage of QDA is that it cannot be used as a dimensionality reduction technique

QDA - Other

• Linear Discriminant Analysis (LDA) vs Quadratic Discriminant Analysis (QDA)