The authors define a new statistic, the parametric number variance, which measures the correlation of fluctuations in energy levels as a parameter external to the system is varied. A semiclassical formula is obtained and regimes of universal and system dependent behaviour are predicted. Numerical calculations of the PNV in two model systems are found to be in good agreement with the semiclassical theory.
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Goldberg et al. (1991) studied this question.
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