1. A method for modeling electrical characteristics of cells having given circuit elements, comprising: determining a relationship between a proximity context of a reference circuit element and an electrical characteristic of the reference circuit element; generating, for at least one of the cells, a plurality of cell proximity context models, based on a given model of the cell, a set of electrical characteristic, and the determined relationship; generating a layout of cells having at least one cell; characterizing at least one cell in said cell layout, based on a value of a given structural parameter of said least one cell, as one of its plurality of cell proximity context models; and generating a set of discrete electrical characteristic models of the cell layout by substituting said at least one cell with the cell proximity context model results.