which variable is a covariable in spss which variable is used to predict the variability of respiratory frequency why is respiratory frequency in rsa what is the dependent variable in respiratory frequency of respiratory rhythms is fresp independent variable how to analyze respiratory frequency variability why is fresp a dependent variable what is rsa as a variable which variable is a covariate for respiratory frequency? which is a dependent variable of respiratory frequency what is the independent variable for respiratory frequency in the psy what is the dependent variable for respiratory rhythm what is the dependent variable of respiratory frequency? what type of variable is respiratory frequency? what is the dependent variable for respiratory frequency of sinus arrhythmia what is the dependent variable of respiratory frequency can respiratory frequency be a covariate what is the dependent variable of respiratory frequency? does respiration frequency depend on rsa how do you standardize respiratory frequency