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In order to capture the curvature by the NGWP model, the data of LEDs is a logarithm transformation and the general function [LAMBDA](t) = [t.
For simplicity, the NGWP model in (1) is referred to as [M.
If the degradation path is assumed to be linear in (18), that is, [LAMBDA](t) = t, then the NGWP model turns into a Linear Wiener Process model.
Similarly, if the measurement errors are not considered, then the NGWP model becomes a Wiener Process model without measurement errors.