"The angle between the wing chord line and the stabiliser chord line is called
the Longitudinal Dihedral (LD) or decalage.
For a given centre of gravity, there is a LD angle that results in a certain
trimmed flight speed and pitch attitude.
If the LD angle is increased the plane will take on a more nose up pitch attitude,
whereas with a decreased LD angle the plane will take on a more nose down
pitch attitude.
There is also the Angle of Incidence, which is the angle of a flying surface
related to a common reference line drawn by the designer along the fuselage.
The designer might want this reference line to be level when the plane is flying
at level flight or when the fuselage is in it's lowest drag position.
The purpose of the reference line is to make it easier to set up the relationships
among the thrust, the wing and the stabiliser incidence angles.
Thus, the Longitudinal Dihedral and the Angle of Incidence are interdependent."

The above is a quote from an knowegable source.
Mike