N.Y. Comp. Codes R. & Regs. tit. 20, § 8186-2.3
The tentative equalization rate or ratio for the current roll is computed by dividing the assessed value of the taxable real property, computed pursuant to section 8186-2.4 of this Subpart, by the full value of the taxable real property, computed pursuant to sections 8186-2.5 and 8186-2.6 of this Subpart.