1. A computer-performed method for visually displaying or numerically mapping systematic wafer-level circuit variation, the method comprising: collecting measurement data from electronic circuits integrated on a wafer, wherein the measurement data is collected from multiple positions within multiple regions of the wafer and is indicative of performance of the electronic circuits; within a computer system, determining a set of parameter values dependent on the measurement data for the multiple positions in the multiple regions; computing a set of normalization values from the set of parameter values for removing per-position systematic variation; adjusting the set of parameter values using the normalization values to remove the per-position systematic variation; and displaying a result of the adjusting as a visual map of wafer level variation or storing the result of the adjusting as a numerical map of wafer level variation in a storage device within the computer system, wherein the visual map or numerical map indicates parameter value levels corresponding to the position within the regions.