So i am recording the polymorphic statistics of iPBS primers and one of the parameters estimated is R (resolving power). From an equation (0,15x + 1,78 = R) i can detect the number of genotypes (x) the primer whose resolving power value is R, could identify. I got from a number of primers, a (x) of negative value .. for instance (-3) ... i am a bit confused how to interpret such a result ... can it be the primer failed to identify 3 genotypes at the max or what ???