Release the software of Durbin-Watson test statistic with the parameter settings:(1) four models can be chosen.
(2) set the autocorrelation coefficient that you need to test.
(3) set the lags.
(4) set your own data of independent variable(s) for models III and IV.
(5) set the sample size numbers for models I and II.What can you obtain?(1) get critical values from sampling distribution which is very close to true distribution with running 100 million times simulations.(2) get the simulated data of the sampling distributions for Durbin-Watson test statistic and sample autocorrelation coefficient.(3) get the coefficients of the sampling distributions.(4) source code is included.The software is based on the probability distribution simulator and freely downloaded on website:  it!