Absolute pitch is roughly ten times more precise than trained relative pitch.

Evidence

Although musicians can improve their ability to assess pitch, the ability of a person with absolute pitch is about ten times more precise in assessing pitch than a person who is trained but does not naturally have this ability. It is as if people with this ability have an inner reference frequency. It has been known for this reference to change with increasing age. Some people also claim that the pitch of recorded music has changed with time. Absolute pitch is not necessarily connected to musical giftedness, though undoubtedly it may help an otherwise musical person in their musical training. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1123

Categorization

• XREF: Connects to debates about whether absolute pitch reflects perception or long-term memory — relates to general literature on expert calibration and reference standards.
• corroborated: 2 independent passages support this claim — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1123