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The value of the order in the command must be a nonnegative integer.

Last post by fyousefi « Tue Mar 02, 2021 2:52 pm

by fyousefi » Tue Mar 02, 2021 2:52 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:52 pm
For estimation of an ARX model, the order matrix should be of the form NN = [na, nb, nk] for input-output data and NN =

Last post by fyousefi « Tue Mar 02, 2021 2:51 pm

by fyousefi » Tue Mar 02, 2021 2:51 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:51 pm
The value of the "IntegrateNoise" option must be TRUE or FALSE.

Last post by fyousefi « Tue Mar 02, 2021 2:51 pm

by fyousefi » Tue Mar 02, 2021 2:51 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:51 pm
The command cannot be used for multi-output time series data. Use the "arx" command instead.

Last post by fyousefi « Tue Mar 02, 2021 2:50 pm

by fyousefi » Tue Mar 02, 2021 2:50 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:50 pm
In the "ar(DATA, N,...)" command, the order N must be a positive integer.

Last post by fyousefi « Tue Mar 02, 2021 2:49 pm

by fyousefi » Tue Mar 02, 2021 2:49 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:49 pm
There are no free parameters in the model to estimate.

Last post by fyousefi « Tue Mar 02, 2021 2:49 pm

by fyousefi » Tue Mar 02, 2021 2:49 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:49 pm
The Output Error model structure does not apply to time series data. Use the "ar" or "arx" command instead.

Last post by fyousefi « Tue Mar 02, 2021 2:48 pm

by fyousefi » Tue Mar 02, 2021 2:48 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:48 pm
Invalid ARX orders. Note that continuous-time ARX models are not supported.

Last post by fyousefi « Tue Mar 02, 2021 2:48 pm

by fyousefi » Tue Mar 02, 2021 2:48 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:48 pm
The Yule-Walker ('yw') algorithm uses pre- and post-windowing ('ppw') only. The specified window will be ignored

Last post by fyousefi « Tue Mar 02, 2021 2:48 pm

by fyousefi » Tue Mar 02, 2021 2:48 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:48 pm
The initial computation of the loss function failed. The initial model, if specified, may be unstable. Consider setting

Last post by fyousefi « Tue Mar 02, 2021 2:47 pm

by fyousefi » Tue Mar 02, 2021 2:47 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:47 pm
Some fixed parameter indices are greater than the parameter vector length.

Last post by fyousefi « Tue Mar 02, 2021 2:47 pm

by fyousefi » Tue Mar 02, 2021 2:47 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:47 pm
The command is for scalar time series data only. Use the "arx" command for data containing input channels.

Last post by fyousefi « Tue Mar 02, 2021 2:46 pm

by fyousefi » Tue Mar 02, 2021 2:46 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:46 pm
A process model cannot be estimated using complex-valued data.

Last post by fyousefi « Tue Mar 02, 2021 2:45 pm

by fyousefi » Tue Mar 02, 2021 2:45 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:45 pm
The Box-Jenkins model structure does not apply to time series data. Use the "ar", "arx", "armax" or "nlarx" command inst

Last post by fyousefi « Tue Mar 02, 2021 2:45 pm

by fyousefi » Tue Mar 02, 2021 2:45 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:45 pm
The one-step ahead prediction error between measured and predicted outputs is minimized during estimation.

Last post by fyousefi « Tue Mar 02, 2021 2:43 pm

by fyousefi » Tue Mar 02, 2021 2:43 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:43 pm
As a result, the estimation focuses on making a good fit for simulation of model response with the current inputs.

Last post by fyousefi « Tue Mar 02, 2021 2:42 pm

by fyousefi » Tue Mar 02, 2021 2:42 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:42 pm
Inverse of square root of magnitude of the frequency response

Last post by fyousefi « Tue Mar 02, 2021 2:42 pm

by fyousefi » Tue Mar 02, 2021 2:42 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:42 pm
A column vector of weights for frequency-domain data only

Last post by fyousefi « Tue Mar 02, 2021 2:41 pm

by fyousefi » Tue Mar 02, 2021 2:41 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:41 pm
For the frequency vector 'w', the weighting is '1./sqrt(abs(G(w)))', where 'G(w)' is the complex frequency response at t

Last post by fyousefi « Tue Mar 02, 2021 2:41 pm

by fyousefi » Tue Mar 02, 2021 2:41 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:41 pm
The initial state is chosen based on the estimation data

Last post by fyousefi « Tue Mar 02, 2021 2:40 pm

by fyousefi » Tue Mar 02, 2021 2:40 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:40 pm
The initial state is estimated using the best least squares fit

Last post by fyousefi « Tue Mar 02, 2021 2:40 pm

by fyousefi » Tue Mar 02, 2021 2:40 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:40 pm
Maximum number of iterations during loss-function minimization, specified as a positive integer.

Last post by fyousefi « Tue Mar 02, 2021 2:39 pm

by fyousefi » Tue Mar 02, 2021 2:39 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:39 pm
The iterations stop when Maximum Iterations is reached or another stopping criterion is satisfied, such as Tolerance.

Last post by fyousefi « Tue Mar 02, 2021 2:39 pm

by fyousefi » Tue Mar 02, 2021 2:39 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:39 pm
Minimum percentage difference between the current value of the loss function and its expected improvement after the next

Last post by fyousefi « Tue Mar 02, 2021 2:38 pm

by fyousefi » Tue Mar 02, 2021 2:38 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:38 pm
When the percentage of expected improvement is less than Tolerance, the iterations stop.

Last post by fyousefi « Tue Mar 02, 2021 2:38 pm

by fyousefi » Tue Mar 02, 2021 2:38 pm

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Last post by fyousefi
Tue Mar 02, 2021 2:38 pm

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