Regression Analysis in Context of Error Structure

Sequential steps are taken imtil the model provides a statistically adequate representation of the data to within the independently obtained stochastic error structure. The comparison between model and experiment can motivate modifications to the model or to the experimental parameters. 

Solution Orazem et al. and Jansen et al. described the impedance response for an n-type GoAs Schottky diode with temperature as a parameter. The system consisted of an n-GaAs single crystal with a Ti Schottky contact at one end and a Au, Ge, Ni Schottky contact at the eutectic composition at the other end. This material has been well characterized in the literature and, in particular, has a well-knozvn EL2 deep-level state that lies 0.83 to 0.85 eV below the conduction band edge. Experimental details are provided by Jansen et 

Solution Low-frequency inductive features are commonly seen in impedance spectra for PEM fuel cells. Makharia et al. suggested that side reactions and intermediates involved in the fuel cell operation can be possible causes of the inductive loop seen at low frequency. However, such low-frequency inductive loops could also be attributed to non-stationary behavior, or, due to the time required to make measurements at low frequencies, nonstationary behavior could influence the shapes of the low-frequency features. 

Roy et al. proposed that the low-frequency inductive loops observed in PEM fuel cells could be caused by parasitic reactions in which the Pt catalyst reacts to form PtO and subsequently forms Pf ions. They also showed that a reaction involving formation of 

Resolution of this ambiguity requires additional experiments. The processes and reactions hypothesized for a given model can suggest experiments to support or reject the underlying hypothesis. For example, the proposed formation of PtO is consistent with a 

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