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    %% Test for Autocorrelation Among Residuals  
% This example shows how to test for autocorrelation among the residuals
% of a linear regression model.   

% Copyright 2015 The MathWorks, Inc.


%% 
% Load the sample data and fit a linear regression model. 
load hald
mdl = fitlm(ingredients,heat);  

%% 
% Perform a two-sided Durbin-Watson test to determine if there is any autocorrelation
% among the residuals of the linear model, |mdl|.  
[p,DW] = dwtest(mdl,'exact','both') 

%%
% The value of the Durbin-Watson test statistic is 2.0526. The $p$-value
% of 0.6285 suggest that the residuals are not autocorrelated.