As an example, look at table A in the bls.gov release. Each column is a roughly 20-dimensional vector, with both positive and negative components. Positive comp

As an example, look at table A in the bls.gov release. Each column is a roughly 20-dimensional vector, with both positive and negative components. Positive components (those which had price increases in the past month) include food and shelter, while negative components include energy/gasoline, used cars, and medical care.