Dusalocks, have you measured your ponytail? I decided to just go by this system:
Quick & Easy Hair Porosity & Density Tests
My ponytail came out at 4 and 1/8th inch, so I declared myself high density. If we're thinking in terms of sheer number of strands, I guess texture (coarse vs. fine) could lead to some inaccuracy in the measurement technique. But in terms of your hair's volume (size/bulk/mass), I think this is a decent enough guideline.