How to Plot Residuals in the App
To create a residual analysis plot for parametric linear and nonlinear models in the System Identification app, select the Model resids check box in the Model Views area. For general information about creating and working with plots, see Working with Plots.
To include or exclude a model on the plot, click the corresponding model icon in the System Identification app. Active models display a thick line inside the Model Board icon.
The following table summarizes the Residual Analysis plot settings.
Residual Analysis Plot Settings
Display confidence intervals around zero.
Confidence internal are not available for nonlinear ARX and Hammerstein-Wiener models.
Change the number of lags (data samples) for which to compute autocorrelation and cross-correlation functions.
For frequency-domain validation data, increasing the number of lags increases the frequency resolution of the residual spectrum and the transfer function.
(Multiple-output system only)
|Select the input-output by name in the Channel menu.|