Characterization of the probability distribution of amplitudes using Gamma and Rayleigh functions.

<p>(<b>a</b>) Probability distribution <i>P(A)</i> for a subject considered to be a low risk for BD at a scale s∼0.59 h, along with Gamma (black line) and Rayleigh (grey line) best-fit functions: based on AIC, the Gamma distribution yields a better fit. (<b>b</b>) Probability distribution <i>P(A)</i> at a scale of s∼3.0 h for the same subject: the fit of the Rayleigh distribution function (gray line) is superior to the Gamma function at this scale, by AIC criteria. (<b>c</b>) Average value of the shape parameter, , at different scales (hours) for 35 subjects considered to be low risk for BD by GBI criteria (open circles) and another 35 at high risk (filled circles).