A simple model, based on random matrix theory, is utilized for the description of energy levels and level dynamics in mixed regular and chaotic quantum systems. We find that different types of level statistics, such as nearest neighbor distributions, long-range correlations, wave function analysis, curvature distributions, etc., show dramatically different sensitivity to the ``chaoticity parameter.'' Differences between long-range and short-range fluctuation measures are explained in terms of localization of the wave functions.
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