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Derived to evaluate if a statistical model corresponds to the data, Haussmann helps one differentiate between fixed and random effects. Specifications:100% Uv protection Lightweight C R-39 lenses for superior clarity Hand- Crafted Mazzucchelli Acetate Frame Base 6 Spherical Lens Italian stainless steel optical hinges Includes hard-shell case / Von Zipper Sunglasses Haussmann in Blk Glos/ Vintage Gry ( Bkv) / Von Zipper