Transfer function estimation with unknown number of poles and zeros

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I have an input and output signal registered in time-domain (discrete).
With
sys = tfest(data,np,Ts);
I can estimate the transfer function given the number of poles. But I don't know how many poles/zeros my transfer function should have to best fit the data.
Is there a way that MATLAB can estimate the best transfer function without these constraints?
Thank you very much.

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Arkadiy Turevskiy
Arkadiy Turevskiy le 25 Avr 2014
No, when using tfest you have to specify the number of poles and zeros.
If you are estimating state-space models, you can make use of the tool that helps you pick the order. See this example . You can then export identified state space model to MATLAB workspace and convert to a transfer function.

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