advice

Analysis and recommendations for data or estimated linear models

Syntax

advice(data)
advice(model,data)


Description

advice(data) displays the following information about the data in the MATLAB^® Command Window:

• What are the excitation levels of the signals and how does this affect the model orders? See also pexcit.

• Does it make sense to remove constant offsets and linear trends from the data? See also detrend.

• Is there an indication of output feedback in the data? See also feedback.

• Would a nonlinear ARX model perform better than a linear ARX model?

advice(model,data) displays the following information about the estimated linear model in the MATLAB Command Window:

• Does the model capture essential dynamics of the system and the disturbance characteristics?

• Is the model order higher than necessary?

• Is there potential output feedback in the validation data?

Input Arguments

data	Specify data as a timetable, a comma-separated matrix pair u,y, or an iddata object.
model	Specify model as an idtf, idgrey, idpoly, idproc, or idss model object.

Version History

Introduced before R2006a

R2022b: Time-domain estimation data is accepted in the form of timetables and matrices

Most estimation, validation, analysis, and utility functions now accept time-domain input/output data in the form of a single timetable that contains both input and output data or a pair of matrices that contain the input and output data separately. These functions continue to accept iddata objects as a data source as well, for both time-domain and frequency-domain data.