1. A computer-implemented method for simulating an electronic circuit having a plurality of circuit components, comprising: at a processor, for at least one circuit component, generating at least one continuous probability function specifying a probability of detecting a particular output value for the circuit component as a function of time, given a transition in an input value for the circuit component; at the processor, applying the at least one generated continuous probability function to a proposed input signal value, in order to generate a prediction of performance of the simulated electronic circuit; and at an output device, outputting the generated prediction; wherein each continuous probability function for each circuit component specifies a probability of a particular output across a range of response times for the circuit component.