Estimate Frequency-Response Models at the Command Line

You can use the etfe, spa, and spafdr commands to estimate spectral models. The following table provides a brief description of each command and usage examples.

The resulting models are stored as idfrd model objects. For detailed information about the commands and their arguments, see the corresponding reference page.

Commands for Frequency Response

Command	Description	Usage
etfe	Estimates an empirical transfer function using Fourier analysis.	To estimate a model m, use the following syntax: m=etfe(data)
spa	Estimates a frequency response with a fixed frequency resolution using spectral analysis.	To estimate a model m, use the following syntax: m=spa(data)
spafdr	Estimates a frequency response with a variable frequency resolution using spectral analysis.	To estimate a model m, use the following syntax: m=spafdr(data,R,w) where R is the resolution vector and w is the frequency vector.

Validate the model after estimating it. For more information, see Model Validation.