1. A method for determining capacitive aggressor-induced crosstalk in a victim net of a stage of an integrated circuit design, comprising: evaluating, using a computer, an effect of each of multiple capacitive aggressor nets of the stage on the victim net to identify a plurality of capacitive aggressor nets each having an effect on the victim net below a threshold; combining the identified plurality of capacitive aggressor nets of the stage to construct a virtual capacitive aggressor net of the stage; determining current waveforms induced on the victim net by individual ones of the plurality of capacitive aggressor nets of the stage; and modeling a current waveform induced by the virtual capacitive aggressor net of the stage on the victim net based on the contribution of the current waveforms determined for the plurality of capacitive aggressor nets of the stage.