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From: "pietro " <bracardi82@email.it>
Newsgroups: comp.soft-sys.matlab
Subject: Re: ident vs fdident
Date: Fri, 14 Aug 2009 13:48:04 +0000 (UTC)
Organization: The MathWorks, Inc.
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"Rajiv Singh" <Rajiv.SinghNoSpam@mathworks.com> wrote in message <h4n0t6$lh0$1@fred.mathworks.com>...
> System Identification Toolbox handles estimation of transfer function from 
> freqyency response data, since version 6.0. For transfer functions, try OE 
> and IDPROC/PEM.
> 
> Rajiv
> 
> "pietro " <bracardi82@email.it> wrote in message 
> news:h4mf1q$t60$1@fred.mathworks.com...
> >I have only system identification toolbox. I have frequency response data 
> >and i have to identificate the transfer function. I can do that with system 
> >identification toolbox or it is necessary to have frequency domain 
> >identification toolbox? 
> 

Thank you. 

I have another question: how can i test the whitness and the correlation between residuals and transfer function? I have idenficated a model and i have to validate it. I have plotted the residual but i don't understand this graph. 

http://www.megaportal.it/imghost/2009/08/14/1535341250256934.jpg

Can you explain me? 
thank you in advance