If the maximum radial clearance is Cr
then Cr = e + Hm
where e is the eccentricity between the shaft & bearing centreline and Hm is the minimum clearance(oil film thickness)
an eccentricity factor can be calculated from the formula
n = e / Cr
Factors involved with the eccentricity factor n are; minimum oil film thickness, journal attitude angle, pressure distribution, peak pressure angle, friction, horsepower loss & oil flow through the loaded region. The latter three determine the temperature of the bearing which for the high speed bearings can be a limiting factor.