User`s guide

8 Model Analysis
Gaussian distribution. For example, a probability of 0.99 (99%) corresponds
to 2.58 stand a rd d e v ia t ions.
Note The calculation of the confidence interval assum es that the model
sufficiently describes the system dynamics and the m odel residuals pass
independence tests.
HowtoPlottheNoiseSpectrumUsingtheGUI
To create a noise spectrum plot for parametric linear m odels in the GU I ,
select the Noise spectrum check box in the Model Views area. For general
information about creating and working w ith plots, see “Working with Plots
in the System Identification Tool GUI” on page 12-15.
To include or exclude a model on the plot, click the corresponding model icon
in the System Identification Tool G U I. Active models display a thick line
inside the Model Board icon.
The following figure shows a sample Noise Spectrum plot.
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