1942 Volume 24 Pages 292-296
The harmomic analysis of a quantity Γ irregularly fluctuating about zero is investigated, and it is found that the mean value of the square of the amplitude of the k-th component is given by
Aκ2=Bκ2=2/τ1/Γ2Θ,
where τ is the whole time interval and Θ is a measure of the correlation between Γ at different time points, defined in the text. The analysis of the derivatives of Γ are also discussed