Averaging such a small, noisy data-set will largely lead to GIGO, unfortunately.
What's important?
1. Does the ship have an inherent advantage to movement or firing range over others in the class, or both?
If yes, then it should have weaker Hull / Armor to compensate, or some other important nerf. Ships in this group include the Wolf, Medusa, etc.
Movement speed is a god-stat when combined with all the range advantages players will inevitably stack on their Captains and ships. Kiting is the way of efficiency in most cases.
The Paragon, for example, has a higher-than-average range, to compensate for its very slow speed, relatively-weak armor for its class, and huge target profile.
2. Does the ship have an unusually-large number of weapon slots aiming on the primary arc, usually forward? The Enforcer can be slow, have poor shielding and generally be "meh" because it's extremely well-armed for a ship of its class, and has many Medium slots that can all hit the frontal arc, giving it greater ranged firepower than others in the same class.
Unfortunately, Vanilla's weapons aren't balanced terribly well against each other, so this tends to be a little messy, rather than clean-cut. Ballistic weapons are superior, simply because of the long-range Kinetic and HE options available in most size classes, whereas Energy weapons tend to get shafted on range, making them far less competitive.
3. Does the ship have a mechanic or System that allows it to avoid damage entirely? This would cover Phase Cloak ships and the Hyperion, which are all designed around that motif, as well as ships like the Scarab that can deal huge amounts of damage while dodging incoming shots with its Temporal Shell. Any ships with this motif need to be nerfed in some way to compensate; the Hyperion doesn't last long, CR-wise, the Phase Cloak ships have other issues.
4. Does the ship have a specialty function that gives it greater alpha damage than normal? This covers the Gryphon, but it's also the idea behind the Astral, to some degree. This used to be the idea behind ships with High Energy Focus, but over time that System has lost a lot of its effective punch, for whatever reasons.