1. The problem statement, all variables and given/known data Hi all, I am curently working with frequency response functions on the basis of 1 input data sample and 1 output data sample. As I would like to plot the coherence function, I need to compute the cross-spectral densities. Since I am new to this field, I would like to ask some of you experts whether it is correct to compute a power cross-spectral density (pcsd) as 2. Relevant equations pcsd_xy = psd_xx.*conj(psd_yy) where psd = power spectral density. 3. The attempt at a solution Is this a correct approach to obtain the cross-spectral density? Kind regards, Martin.