A main tool used to mass appraisal of real estate in Poland are lineal models of regression. Regression analyses are usually labour-consuming and seldom give on the small property markets precise value of real estates. In the paper was presented for statistical methods alternative procedure of real estate valuation at the not enough accessibility to information of transaction. Proposed method uses foundations of rough set theory in conjunction with value tolerance relation. Proposed conjunction enable analysis of data presented in the quantitative form on the contrary to the classical rough set theory.

35-51