Fig. 2. Prediction probability (PK) of weighted spectral median frequency (WSMF) based on development study A at fixed cutoff frequencies f low= 5 Hz ,f high= 50 Hz ( A ) and f low= 9 Hz , f high = 30 Hz ( B ). For the exponent p ( x-axis ), settings between 0.2 and 2.0 are displayed; for the splitting ratio r ( y-axis ), settings between 0.1 and 0.95 are displayed. The resulting PKvalues of WSMF with corresponding settings of p and r are plotted as third dimension ( z-axis ,left ) and represented as superposed colors , where the scaling of the PKvalues is indicated by gradient bars . A relation between p and r can be observed if values of PK≥ 0.80 are assumed ( red area ). The PKvalues are interpolated giving a continuous approximation of the discrete settings to obtain a better presentation ( left and right ).