1. A method for clarifying a subject's collected ECG waveform for analysis by first effectively removing a recognized, embedded influence over certain characteristics of that waveform which exists by virtue of the physiologic presence, in the subject's heart, of a particular ECG confounder, said method comprising creating a reference ECG waveform model which possesses the characteristics of an ECG waveform that is influenced by the presence of the particular confounder, using that model, linking it relationally to an appropriate ECG purge algorithm which, in cooperation with the model, can be applied to such a subject's collected ECG waveform to remove the influence of the confounder, and applying that linked model and purge algorithm to such a collected ECG waveform, thus to produce a purge-processed ECG waveform that lacks the influence of the selected confounder.