Steps 1 and 2. Same as for the Bland–Altman plot CVA (see Box 4, Steps 1 and 2). 3. Retrieve an informative parameter for the variable of interest from the analyzed data. Instantaneous HR was chosen as a stress parameter, since this is an often used measure (Schubert et al., 2009) and is for most people an intuitive measure related to CVA. Steps 4 and 5. Same as for the EDA parameter (see Box 5, Steps 4 and 5).