User`s guide

Using Impulse- and Step-Response Plots to Validate Models
Transient Response Plot Settings (Continued)
Action
Command
(Multiple-output system only)
Select an input-output pair
to view the noise spectrum
corresponding to those channels.
Selecttheoutputbynameinthe
Channel menu.
If the plotted models include a noise
model, you can display the transient
response propertie s associated with
each output channel. The name of the
channel has the format
e@OutputName,
where
OutputName is the name of the
output channel corresponding to the
noise model.
(Step response for nonlinear
models only)
Set lev el of the input step.
Note For multiple-input models,
the input-step level applies only
to the input channel you selected
to display in the plot.
Select Options > Step Size,andthen
chose from two options:
• 0–>1 sets the l ow er level to
0 and the
upper level to
1.
• Other opens the Step Level dialog
box, where you enter the v a lues for
the low er and upper level values.
Displaying the Confidence Interval
In addition to the transient-response curve, you can display a con fidence
interval on the plot. To learn how to show or hide confidence interval, see the
description of the plot settings in “How to Plot Impulse and Step Response
Using the GUI” on page 8-26.
The confidence interval corresponds to the range of response values w ith a
specific probability of being the actual response of the system. The toolbox
uses the estimated uncertainty in the model parameters to calculate
confidence intervals and assumes the estimates have a Gaussian distribution.
For example, for a 95% confidenceinterval,theregionaroundthenominal
curve represents the range of values that have a 95% probability of being the
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