Measurement model for analysis of electrochemical impedance data

A tutorial is presented for the recently published measurement model program, made available under the open-source license GNU GPL Version 3, which allows free use for scientific purposes but limits commercial use. The program may be used to identify the portion of the measured frequency range suitable for subsequent regression analysis, the stochastic error structure used to weight the regressions, and some key parameters such as the ohmic resistance and capacitance, enabling calculation of the critical frequency associated with electrode-geometry-induced frequency dispersion. The equation-based custom-model part of the program enables regression of models that are not limited to electrical circuits. The measurement model enables a more sophisticated analysis of impedance data, allowing researchers to take full advantage of the information that can be extracted from electrochemical impedance spectroscopy measurements.