Path: news.mathworks.com!not-for-mail
From: "pietro " <bracardi82@email.it>
Newsgroups: comp.soft-sys.matlab
Subject: system indentification: residuals analysis
Date: Sun, 31 May 2009 20:11:01 +0000 (UTC)
Organization: The MathWorks, Inc.
Lines: 5
Message-ID: <gvuo8l$t$1@fred.mathworks.com>
Reply-To: "pietro " <bracardi82@email.it>
NNTP-Posting-Host: webapp-03-blr.mathworks.com
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 8bit
X-Trace: fred.mathworks.com 1243800661 29 172.30.248.38 (31 May 2009 20:11:01 GMT)
X-Complaints-To: news@mathworks.com
NNTP-Posting-Date: Sun, 31 May 2009 20:11:01 +0000 (UTC)
X-Newsreader: MATLAB Central Newsreader 1184971
Xref: news.mathworks.com comp.soft-sys.matlab:543822


Hi,

I have to estimate a transfer function parameters from frequency response data and i have used the arx command. I have plotted the models residuals but i don't understand if the model is good. In this link there are the gain frequency response and the model residual. 

http://img10.imageshack.us/img10/6499/residuals.jpg